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Example Questions
Example Question #361 : Functions And Lines
Find the equation of the line with point and slope of
.
Use the point-slope formula to find the equation:
Example Question #21 : How To Find The Equation Of A Line
Which of the following equations in standard form describes a line passing through the point with a slope of
Start by using point-slope form:
Multiply the right side by the distributive property:
Then, convert to standard form:
Example Question #361 : Functions And Lines
Rewrite in slope-intercept form: .
Slope-intercept form is , where
is the slope and
is the y-intercept. To rewrite the original equation in slope-intercept form, you must isolate the
variable:
Now, divide each side by 20 so that stands alone and simplify, and you are left with the slope-intercept form of the equation:
Example Question #1 : Solving Functions
Find the equation for the line goes through the two points below.
Let .
First, calculate the slope between the two points.
Next, use the slope-intercept form to calculate the intercept. We are able to plug in our value for the slope, as well the the values for .
Using slope-intercept form, where we know and
, we can see that the equation for this line is
.
Example Question #21 : How To Find The Equation Of A Line
What is the equation of the line connecting the points and
?
Equation is undefined or does not exist.
To find the equation of this line, we need to know its slope and y-intercept. Let's find the slope first using our general slope formula.
The points are and
. In this case, our points are (–3,0) and (2,5). Therefore, we can calculate the slope as the following:
Our slope is 1, so plug that into the equation of the line:
We still need to find b, the y-intercept. To find this, we pick one of our points (either (–3,0) or (2,5)) and plug it into our equation. We'll use (–3,0).
Solve for b.
The equation is therefore written as .
Example Question #27 : How To Find The Equation Of A Line
Which is the correct equation for this line?
The equation for a line takes the form where m is the slope and b is the y-intercept, where the graph hits the y-axis.
The y-intercept of this line is 1, so b=1.
We can figure out the slope by comparing how far the line goes up vs. how far it goes over between any 2 points. The two most obvious points on the graph are at and
. Between these two points, the graph moves down 1 and over 5. This means the slope is
, so we'll put that in for m.
The equation is then .
Example Question #28 : How To Find The Equation Of A Line
Which is the correct equation for this line?
The equation for a line takes the form where m is the slope and b is the y-intercept, where the graph hits the y-axis.
The y-intercept of this line is -4, so b=-4.
We can figure out the slope by comparing how far the line goes up vs. how far it goes over between any 2 points. The two most obvious points on the graph are at and
. Between these two points, the graph moves up 3 and over 5. This means the slope is
, so we'll put that in for m.
The equation is then .
Example Question #31 : How To Find The Equation Of A Line
Find the equation of the line in the form
with through the point
.
We are given the slope and a point, which we will plug into .
.
Thus, using the given and the
you just found, the equation of our line is:
Example Question #31 : Slope And Line Equations
Using the data provided, find the equation of the line.
The equation for a line is always , where
and
.
Given two data points, we are able to find the slope, m, using the formula
.
Using the data points provided, our formula will be:
, which gives us
or ,
.
Our y-intercept is given.
Thus our equation for the line containing these points and that y-intercept is .
Example Question #361 : Functions And Lines
Find the equation of a line given the points .
The equation of a line is , where "m" is the slope of the line and "b" is the point at which the line intercepts the y-axis.
The first thing we must do is use the formula
to find the slope, or "m."
If we plug in the points of the two coordinates given,
,
we find our slope, "m."
Since our y-intercept is given, we now have everything we need for our equation,
.
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