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2 Answers

3x - y = 0
5x + 5 = 0
 
Solve for x:
 
5x + 5 = 0
5x = -5                   [Subtract 5 from both sides]
x = -1                    [Divide both sides by 5]
 
Plug x = -1 into the first equation and solve for y:
 
3x - y = 0
3(-1) - y = 0          [Plugged in -1 in place of x, since x = -1]
-3 - y = 0               [Add y to both sides]
-3 = y