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2x + 6y = -14
2x = -14 - 6y
2x - y = 7
-14 - 6y - y = 7
-7y = 7 + 14
-7y = 21
7y = -21
y = -21 / 7
y = -3
2x - y = 7
2x - (-3) = 7
2x + 3 = 7
2x = 7 - 3
2x = 4
x = 4 / 2
x = 2
3x - 4y = 3(2) - 4(-3)
= 6 - (-12)
= 6 + 12
= 18