Question

The points (-1,4) and (2,r) lie on the line with slope -3. Find the missing coordinate r. R=?

Answer 1

r=-5

Explanation:

-3=r-4/2-(-1) (plug into the slope formula)

-3=r-4/3 (solve the denominator)

-9=r-4 (multiply both sides by 3)

-5=r (add 4 to both sides)