Question

What is the slope of the line that passes through the points (-2,9) and (8,34)?

Write your answer in simplest form.

Answer 1

2.5

Explanation:

y=ax+b

9= -2a+b <=> b= 9+2a

34=8a+b = 8a+9+2a = 10a + 9

a = (34-9)/10 = 2.5

Answer 2

• m = 2.5

Explanation:

Use the slope formula:

• m = (y₂ - y₁)/(x₂ - x₁)
• m = (34 - 9)/(8 - (-2)) = 25/10 = 2.5