Question

Solve the following system of equations.

x + y = 12
x – y = 6



(9, 3)

no solution

infinite number of solutions

(3, 9)

Answer 1

x + y = 12
x - y = 6
---------------add
2x = 18
x = 18/2
x = 9

x + y= 12
9 + y = 12
y = 12 - 9
y = 3

solution is (9,3)