9. Write the equation in slope-

intercept form of the line that

passes through (12, 9) and is

perpendicular to the graph of

y = - 3/4x + 1.

y = (4/3) x - 7

Step-by-step explanation:

For perpendicular lines,

m1*m2 = - 1, where m1 and m2 are their gradients

m1 = - 3/4

-3/4 * m2 = - 1

m2 = 4/3

y = (4/3) x + c

When x = 12, y = 9

9 = (4/3) (12) + c

9 = 16 + c

c = - 7

y = (4/3) x - 7