The points(-9,r) and (-1,6) lie on a line with slope 1/4 . Find the missing coordinate .

Answer 1

The slope is given by Y2 - Y1 / X2 - X1 = 1/4.

Let Y2 be 6 and Y1 be r; X2 be -1 and X1 be -9.

6 - r / 1 - (-9) = 1/4 Solve for r.

answer r 4

Answer 2

1/4 = (r - 6)/(-9 + 1); r - 6 = - 2; r = 4.