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2x-5y=-16 (x5)
5x+2y=-11 (x2)
10x - 25y = -80
10x + 4y = -22 (dikurang)
-29y = -58
y = 2
10x + 4y = -22
10x + 4(2) = -22
10x + 8 = -22
10x = -22-8
10x = -30
x = -3
7x-8y
=7(-3) - 8(2)
=-21-16
=-37