Question

The points (-5,-1) and (r,8) fall on a line with a slope of-9. what is the value of r?

Answer 1

The points (-5,-1) and (r,8) fall on a line with a slope of-9. what is the value of r?

Applying the formula to calculate the slope

m=(8+1)/(r+5)

m=9/(r+5)

Remember that

m=-9

so

-9=9/(r+5)

r+5=-1

r=-6