SSAT Upper Level Math : Geometry

Study concepts, example questions & explanations for SSAT Upper Level Math

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Example Questions

Example Question #2 : Coordinate Geometry

What is the equation of a line that passes through coordinates \dpi{100} \small (2,6) and \dpi{100} \small (3,5)?

Possible Answers:

\dpi{100} \small y=3x+2

\dpi{100} \small y=-x+8

\dpi{100} \small y=2x-4

\dpi{100} \small y=2x+4

\dpi{100} \small y=x+7

Correct answer:

\dpi{100} \small y=-x+8

Explanation:

Our first step will be to determing the slope of the line that connects the given points.

Our slope will be . Using slope-intercept form, our equation will be . Use one of the give points in this equation to solve for the y-intercept. We will use \dpi{100} \small (2,6).

Now that we know the y-intercept, we can plug it back into the slope-intercept formula with the slope that we found earlier.

This is our final answer.

Example Question #61 : Geometry

Which of the following equations does NOT represent a line?

Possible Answers:

Correct answer:

Explanation:

The answer is .

A line can only be represented in the form  or , for appropriate constants , , and . A graph must have an equation that can be put into one of these forms to be a line.

 represents a parabola, not a line. Lines will never contain an term.

Example Question #143 : Coordinate Geometry

Let y = 3x – 6.

At what point does the line above intersect the following:

 

 

Possible Answers:

They do not intersect

(–5,6)

They intersect at all points

(0,–1)

(–3,–3)

Correct answer:

They intersect at all points

Explanation:

If we rearrange the second equation it is the same as the first equation. They are the same line.

Example Question #2 : Lines

A line has a slope of  and passes through the point . Find the equation of the line.

Possible Answers:

Correct answer:

Explanation:

In finding the equation of the line given its slope and a point through which it passes, we can use the slope-intercept form of the equation of a line:

, where  is the slope of the line and  is its -intercept.

Plug the given conditions into the equation to find the -intercept.

Multiply:

Subtract  from each side of the equation:

Now that you have solved for , you can write out the full equation of the line:

Example Question #62 : Geometry

Find the equation of a line that has a slope of  and passes through the points .

Possible Answers:

Correct answer:

Explanation:

In finding the equation of the line given its slope and a point through which it passes, we can use the slope-intercept form of the equation of a line:

, where  is the slope of the line and  is its -intercept.

Since the problem gives us the slope of the line , we just need to use the point that is given to us to find the -intercept. Plug in known values for  and  taken from the given point into the  equation to find the -intercept:

Multiply:

Subtract  from each side of the equation:

Now that you've solved for , you can plug the given slope  and the -intercept  into the slope-intercept form of the equation of a line to figure out the answer:

Example Question #63 : Geometry

Find the equation of the line that has a slope of  and passes through the point .

Possible Answers:

Correct answer:

Explanation:

In finding the equation of the line given its slope and a point through which it passes, we can use the slope-intercept form of the equation of a line:

, where  is the slope of the line and  is its -intercept.

Since the problem gives us the slope of the line , we just need to use the point that is given to us to find the -intercept. Plug in known values for  and  taken from the given point into the  equation and solve for  to find the -intercept:

 

Multiply:

Subtract  from each side of the equation:

Now, we can write the final equation by plugging in the given slope  and the -intercept :

Example Question #64 : Geometry

Find the equation of the line that has a slope of  and passes through the point .

Possible Answers:

Correct answer:

Explanation:

In finding the equation of the line given its slope and a point through which it passes, we can use the slope-intercept form of the equation of a line:

, where  is the slope of the line and  is its -intercept.

Since the problem gives us the slope of the line , we just need to use the point that is given to us to find the -intercept. Plug in known values for  and  taken from the given point into the  equation and solve for  to find the -intercept:

 

Multiply:

Add  to each side of the equation:

Now, we can write the final equation by plugging in the given slope  and the -intercept :

Example Question #65 : Geometry

Find the equation of a line that has a slope of  and passes through the points .

Possible Answers:

Correct answer:

Explanation:

In finding the equation of the line given its slope and a point through which it passes, we can use the slope-intercept form of the equation of a line:

, where  is the slope of the line and  is its -intercept.

Since the problem gives us the slope of the line , we just need to use the point that is given to us to find the -intercept. Plug in known values for  and  taken from the given point into the  equation and solve for  to find the -intercept:

Multiply:

Subtract  from both sides of the equation:

Now, we can write the final equation by plugging in the given slope  and the -intercept :

Example Question #66 : Geometry

Find the equation of the line that has a slope of  and passes through the point .

Possible Answers:

Correct answer:

Explanation:

The question gives us both the slope and the -intercept of the line, allowing us to write the following equation by inserting those values into the slope-intercept form of the equation of a line, :

Alternatively, if you did not realize that the problem gives you the -intercept, you could solve it by using the slope-intercept form of the equation of a line. Since the problem gives us the slope of the line , we would just need to use the point that is given to us to find the -intercept. We could plug in the known values for  and  taken from the given point into the  equation and solve for  to find the -intercept:

Multiplying leaves us with:

We could then substitute in the given slope and the -intercept into the  equation to arrive at the correct answer:

Example Question #67 : Geometry

Find the equation of a line that has a slope of  and passes through the point .

Possible Answers:

Correct answer:

Explanation:

The question gives us both the slope and the -intercept of the line. Remember that  represents the slope, and  represents the -intercept to write the following equation:

Alternatively, if you did not realize that the problem gives you the -intercept, you could solve it by using the slope-intercept form of the equation of a line:

, where  is the slope of the line and  is its -intercept.

Since the problem gives us the slope of the line , we would just need to use the point that is given to us to find the -intercept. We could plug in the known values for  and  taken from the given point into the  equation and solve for  to find the -intercept:

Multiplying leaves us with:

.

We could then substitute in the given slope and the -intercept into the  equation to arrive at the correct answer:

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