Find the slope from two points

Use the slope formula to compute rate of change from coordinate pairs.

Lesson 2

Concept

Slope formula m = (y2 - y1)/(x2 - x1) compares vertical and horizontal change between two points.

Find slope through (-2, 5) and (3, -5).

Slope through (1,2) and (4,8) is:

What causes slope sign errors?

Simplifying fractions

Inconsistent subtraction order

Using parentheses

Using decimals

These steps are out of order — can you fix them?

1.Interpret sign/value

2.Label points

3.Substitute into formula

4.Simplify numerator/denominator

How can you check a slope value quickly?