y= -1
To solve for y, substitute 1 for x
6(1)-3y=9
6-3y=9
-6 -6
-3y=3
y=-1
You can stop here, but it’s best to always check your answer.
To check it, plug in -1 for y and solve for x. Using those answers, plug in the x and y values into the equation and the answer should equal to 9.