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4x - 5y = -34-------> kalikan 3
menjadi
12x + 16y = - 40
12x - 15y = - 102 _
31y = 62
y = 62/31
y = 2
subtitusikan
3x -4y = -10
3x -4(2) = -10
3x -8 = -10
3x = -10 + 8
3x = -2
x = -2/3
nilai dari 8x + 3y
8x + 3y = 8(-2/3) + 3(2)
=-16/3 + 6
= (-16 + 18)/3
= 2/3