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2y - 3x = 7 + 1
2y - 3x = 8
2y - 1 = x - 5
2y - x = -5 + 1
2y - x = -4
-x = -4 - 2y
x = 4 + 2y
2y - 3x = 8
2y - 3(4 + 2y) = 8
2y - 12 - 6y = 8
2y - 6y = 8 + 12
-4y = 20
y = -5
2y - 3x = 8
2(-5) - 3x = 8
-10 - 3x = 8
-3x = 8 + 10
-3x = 18
x = -6
Himpunan Penyelesaian = {x, y} = {-6, -5}
Jadi jawabannya adalah yang c. {(-6,-5)}.