Home > CCA > Chapter 2 > Lesson 2.2.3 > Problem2-71

2-71.

Find the slope of the line passing through each pair of points below. Homework Help ✎

• One possible option is to plot the points, make a line connecting them, and make a slope triangle to find the rise over the run.

• A second possible way is to subtract the y's and then subtract the x's.

1. (1, 2) and (4, −1)

$\frac{2-(-1)}{1-4}=\frac{3}{-3}=-1$

The slope of part (a) is −1.

2. (7, 3) and (5, 4)

3. (−6, 8) and (−8, 5)

4. (55, 67) and (50, 68)

5. Azizah got 1 for the slope of the line through points (1, 2) and (4, −1). Explain to her the mistake she made and how to find the slope correctly.

• Solve using one of the two methods above, and compare your answer to the slope that Azizah found.