### Home > CCA > Chapter 2 > Lesson 2.3.2 > Problem 2-91

2-91.

Find the equation of the line that goes through the points (–15, 70) and (5, 10). 2-91 HW eTool (Desmos). Homework Help ✎.

Use the eTool below to help solve the problem.

Click the link at right for the full version of the eTool: CCA 2-91 HW eTool

One strategy is to graph the two points and make a slope triangle to find the slope of the line.

Use the slope triangle to find the slope of this line.

Substitute a pair of coordinates for *x* and *y* and the slope to solve for *b*. *y* = *mx* + *b*

10 = −3(5) + *b*

10 = −15 + *b*

25 = *b*

Substitute the values found for *m* and *b* into the equation of the line.