Question

Find the value of a that makes the ordered pair a solution of the equation

9x - 5y = -9;(a-1,9)
help

Answer 1

a = 5

Explanation:

assuming (a-1, 9) is in the form of (x,y):

9(a-1) - 5(9) = -9

9a - 9 - 45 = -9

9a = 45

a = 5