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6x - 3y = 30
4x = 2 - y
4x = 2 - y
y = 2 - 4x (substitute 2 - 4x for y into the first equation)
6x - 3y = 30
6x - 3(2 - 4x) = 30
6x - 6 + 12x = 30
18x = 36
x = 2
y = 2 - 4x (substitute 2 for x)
y = 2 - 4(2) = 2 - 8 = -6
So the solution is x = 2, and y = -6.
x + y = 2 + -6 = -4
Thus, it is true that x + y = -4.
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