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10x-5y+15 - 21 + 9y = 60
10x + 4y = 66
persamaan 2
12x + 3y + 6 - 2x - 8 = 60
10x + 3y = 62
dieliminasi
10x + 4y = 66
10x + 3y = 62
----------------------- -
y = 4
10x + 3(4) = 62
10x + 12 = 62
10x = 50
x = 5
maka nilai 8x + 2y
8(5) + 2(4) = 40 + 8 = 48