What is the solution to the system of equations below?

y = - 1/3 x + 9 and y = 2/3 x - 12

x=21, y=2 OR (21, 2)

Step-by-step explanation:

solve using substitution:

-1/3x + 9 = 2/3x - 12

9 = x - 12 (add 1/3 to both sides)

x = 21 (add 12 to both sides)

substitute x into first equation to find y (y = - 1/3x + 9)

y = - 1/3 (21) + 9

y = - 7 + 9

y = 2

Answer : x = 21, y = 2 OR (21, 2)