Home > CC4 > Chapter 2 > Lesson 2.2.4 > Problem2-85

2-85.

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

1. (1, 2) and (4, –1)

• Review the Math Notes box in Lesson 2.1.4 on slope.

• $\text{Slope }=\frac{\Delta y}{\Delta x}=\frac{-1-2}{4-1}=\frac{-3}{3}=-1$

1. (7, 3) and (5, 4)

• See Hint (a):

1. (–6, 8) and (–8, 5)

1. (55, 67) and (50, 68)

1. 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 calculate the slope correctly.

• She should have gotten −1 for her slope.
Can you figure out what mistake she made?