Question

What is the slope of the line going through (-8,13) and (-7,9)?

What is the point slope formula using (-8,13)?

What is the point slope formula using (-7,9)?

Answer 1

1. m = -4

2. y - 13 = -4(x + 8)

3. y - 9 = -4(x + 7)

Explanation:

Slope m = (y2-y1)/(x2-x1)

m = (9 - 13)/(-7 - -8) = -4/+1 = -4

The point slope formula using (-8,13):

y - 13 = -4(x- -8) => y - 13 = -4(x + 8)

The point slope formula using (-7,9):

y - 9 = -4(x - -7) => y - 9 = -4(x + 7)