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Verified answer
2d)x + 2y = 0
x = -2y
substitusikan ke persamaan kedua
2x - 3y = 7
2(-2y) - 3y = 7
-4y - 3y = 7
-7y = 7
y = -1
x = -2y
x = -2(-1)
x = 2
2e)
y = 2x
substitusikan ke persamaan kedua
y = -x - 3
2x = -x - 3
2x + x = -3
3x = -3
x = -1
y = 2x
y = 2(-1)
y = -2