3x - y = 9

2x + y = 6

what is the solution to this using the addition method

Add the y so they cancel out and leave you with: 5x=15

Divide the 5: x=3

Plug in the value x in any of the two equations and solve to get the value of y

(I'm picking the first one just cause)

3 (3) - y = 8

Multiply: 9 - y = 9

Solve: y = 0

Answer: (3,0)