All Common Core: 8th Grade Math Resources
Example Questions
Example Question #3 : Solve Problems Leading To Two Linear Equations: Ccss.Math.Content.8.Ee.C.8c
A line passes through the points and . A second line passes through the points and . Will these two lines intersect?
Yes
No
Yes
To determine if these lines will intersect, we can plot the coordinate points and draw a line to connect the points:
As shown in the graph, the lines do intersect.
Another way to solve this problem is to solve for the two linear equations of the lines that pass through the given coordinate points. We want our equations to be in slope intercept form:
First, we want to solve for the slopes of the two lines. To solve for slope, we use the following formula:
The slope for the first set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can subtract from both sides to solve for :
Our equation for this line is
The slope for the second set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can add to both sides to solve for :
Our equation for this line is
Now that we have both equations in slope-intercept form, we can set them equal to each other and solve:
We want to combine like terms, so let's subtract from both sides:
Next, we can subtract from both sides:
Finally, we can divide by both sides to solve for
Remember, when we are solving a system of linear equations, we are looking for the point of intersection; thus, our answer should have both and values.
Now that we have a value for , we can plug that value into one of our equations to solve for
Our point of intersection for these two lines is This proves that the two lines made from the two sets of coordinate points do intersect.
Example Question #232 : Grade 8
A line passes through the points and . A second line passes through the points and . Will these two lines intersect?
Yes
No
Yes
To determine if these lines will intersect, we can plot the coordinate points and draw a line to connect the points:
As shown in the graph, the lines do intersect.
Another way to solve this problem is to solve for the two linear equations of the lines that pass through the given coordinate points. We want our equations to be in slope intercept form:
First, we want to solve for the slopes of the two lines. To solve for slope, we use the following formula:
The slope for the first set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can subtract to both sides to solve for :
Our equation for this line is
The slope for the second set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can add to both sides to solve for :
Our equation for this line is
Now that we have both equations in slope-intercept form, we can set them equal to each other and solve:
We want to combine like terms, so let's subtract from both sides:
Next, we can subtract from both sides:
Finally, we can divide by both sides to solve for
Remember, when we are solving a system of linear equations, we are looking for the point of intersection; thus, our answer should have both and values.
Now that we have a value for , we can plug that value into one of our equations to solve for
Our point of intersection for these two lines is This proves that the two lines made from the two sets of coordinate points do intersect.
Example Question #233 : Grade 8
A line passes through the points and . A second line passes through the points and . Will these two lines intersect?
Yes
No
Yes
To determine if these lines will intersect, we can plot the coordinate points and draw a line to connect the points:
As shown in the graph, the lines do intersect.
Another way to solve this problem is to solve for the two linear equations of the lines that pass through the given coordinate points. We want our equations to be in slope intercept form:
First, we want to solve for the slopes of the two lines. To solve for slope, we use the following formula:
The slope for the first set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can add to both sides to solve for :
Our equation for this line is
The slope for the second set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can subtract from both sides to solve for :
Our equation for this line is
Now that we have both equations in slope-intercept form, we can set them equal to each other and solve:
We want to combine like terms, so let's add to both sides:
Next, we can add to both sides:
Finally, we can divide by both sides to solve for
Remember, when we are solving a system of linear equations, we are looking for the point of intersection; thus, our answer should have both and values.
Now that we have a value for , we can plug that value into one of our equations to solve for
Our point of intersection for these two lines is This proves that the two lines made from the two sets of coordinate points do intersect.
Example Question #11 : Solve Problems Leading To Two Linear Equations: Ccss.Math.Content.8.Ee.C.8c
A line passes through the points and . A second line passes through the points and . Will these two lines intersect?
No
Yes
Yes
To determine if these lines will intersect, we can plot the coordinate points and draw a line to connect the points:
As shown in the graph, the lines do intersect.
Another way to solve this problem is to solve for the two linear equations of the lines that pass through the given coordinate points. We want our equations to be in slope intercept form:
First, we want to solve for the slopes of the two lines. To solve for slope, we use the following formula:
The slope for the first set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can add to both sides to solve for :
Our equation for this line is
The slope for the second set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can subtract from both sides to solve for :
Our equation for this line is
Now that we have both equations in slope-intercept form, we can set them equal to each other and solve:
We want to combine like terms, so let's add to both sides:
Next, we can add to both sides:
Finally, we can divide by both sides to solve for
Remember, when we are solving a system of linear equations, we are looking for the point of intersection; thus, our answer should have both and values.
Now that we have a value for , we can plug that value into one of our equations to solve for
Our point of intersection for these two lines is This proves that the two lines made from the two sets of coordinate points do intersect.
Example Question #11 : Solve Problems Leading To Two Linear Equations: Ccss.Math.Content.8.Ee.C.8c
A line passes through the points and . A second line passes through the points and . Will these two lines intersect?
Yes
No
No
To determine if these lines will intersect, we can plot the coordinate points and draw a line to connect the points:
As shown in the graph, the lines do not intersect.
Another way to solve this problem is to solve for the two linear equations of the lines that pass through the given coordinate points. We want our equations to be in slope intercept form:
First, we want to solve for the slopes of the two lines. To solve for slope, we use the following formula:
The slope for the first set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can subtract from both sides to solve for :
Our equation for this line is
The slope for the second set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can add to both sides to solve for :
Our equation for this line is
Notice that both of these lines have the same slope, but different , which means they will never intersect.
Example Question #13 : Solve Problems Leading To Two Linear Equations: Ccss.Math.Content.8.Ee.C.8c
A line passes through the points and . A second line passes through the points and . Will these two lines intersect?
No
Yes
No
To determine if these lines will intersect, we can plot the coordinate points and draw a line to connect the points:
As shown in the graph, the lines do not intersect.
Another way to solve this problem is to solve for the two linear equations of the lines that pass through the given coordinate points. We want our equations to be in slope intercept form:
First, we want to solve for the slopes of the two lines. To solve for slope, we use the following formula:
The slope for the first set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can add to both sides to solve for :
Our equation for this line is
The slope for the second set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can subtract from both sides to solve for :
Our equation for this line is
Notice that both of these lines have the same slope, but different , which means they will never intersect.
Example Question #237 : Grade 8
A line passes through the points and . A second line passes through the points and . Will these two lines intersect?
Yes
No
No
To determine if these lines will intersect, we can plot the coordinate points and draw a line to connect the points:
As shown in the graph, the lines do not intersect.
Another way to solve this problem is to solve for the two linear equations of the lines that pass through the given coordinate points. We want our equations to be in slope intercept form:
First, we want to solve for the slopes of the two lines. To solve for slope, we use the following formula:
The slope for the first set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can add to both sides to solve for :
Our equation for this line is
The slope for the second set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can subtract from both sides to solve for :
Our equation for this line is
Notice that both of these lines have the same slope, but different , which means they will never intersect.
Example Question #14 : Solve Problems Leading To Two Linear Equations: Ccss.Math.Content.8.Ee.C.8c
A line passes through the points and . A second line passes through the points and . Will these two lines intersect?
No
Yes
No
To determine if these lines will intersect, we can plot the coordinate points and draw a line to connect the points:
As shown in the graph, the lines do not intersect.
Another way to solve this problem is to solve for the two linear equations of the lines that pass through the given coordinate points. We want our equations to be in slope intercept form:
First, we want to solve for the slopes of the two lines. To solve for slope, we use the following formula:
The slope for the first set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can subtract from both sides to solve for :
Our equation for this line is
The slope for the second set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can subtract from both sides to solve for :
Our equation for this line is
Notice that both of these lines have the same slope, but different , which means they will never intersect.
Example Question #239 : Grade 8
A line passes through the points and . A second line passes through the points and . Will these two lines intersect?
Yes
No
No
To determine if these lines will intersect, we can plot the coordinate points and draw a line to connect the points:
As shown in the graph, the lines do not intersect.
Another way to solve this problem is to solve for the two linear equations of the lines that pass through the given coordinate points. We want our equations to be in slope intercept form:
First, we want to solve for the slopes of the two lines. To solve for slope, we use the following formula:
The slope for the first set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can subtract from both sides to solve for :
Our equation for this line is
The slope for the second set of coordinate points:
Now that we have our slope, the formula is:
To solve for , or the , we can plug in one of the coordinate points for the and value:
We can subtract from both sides to solve for :
Our equation for this line is
Notice that both of these lines have the same slope, but different , which means they will never intersect.
Example Question #2091 : Psat Mathematics
Read, but do not solve, the following problem:
Adult tickets to the zoo sell for $11; child tickets sell for $7. One day, 6,035 tickets were sold, resulting in $50,713 being raised. How many adult and child tickets were sold?
If and stand for the number of adult and child tickets, respectively, which of the following systems of equations can be used to answer this question?
6,035 total tickets were sold, and the total number of tickets is the sum of the adult and child tickets, .
Therefore, we can say .
The amount of money raised from adult tickets is $11 per ticket mutiplied by tickets, or dollars; similarly, dollars are raised from child tickets. Add these together to get the total amount of money raised:
These two equations form our system of equations.