IXL | Write a linear equation from a graph

Write the equation of this line in slope-intercept form.

Write your answer using integers, proper fractions, and improper fractions in simplest

form.

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question

Write the equation of this line in slope-intercept form.

Write your answer using integers, proper fractions, and improper fractions in simplest

form.

key idea

This is the slope-intercept form for the equation of a line with slope

and

-intercept

The

slope,

measures the line's steepness and direction. You can use this formula to find the slope of a line.

rise

run

change in

The

-intercept

is the value of

where the line crosses the

-axis.

solution

First, find the

-intercept

of the line. Since the line crosses the

-axis

(

–

)

the

-intercept

–

Next, find the slope. One point on the line is

(

–

)

Pick another point on the line, like

(

–

)

To get from

(

–

)

(

–

)

move down 2 units and right 3 units.

Since the change in

–

and the change in

is 3, the slope of the line is

–

Finally, write the equation of the line in slope-intercept form.

–

Looking for more? Try these:

Lesson: Slope-intercept form

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Not feeling ready yet? These can help:

W.1Find the slope from a graph

Lesson: Slope-intercept form

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