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3x+2y = 8. I x1 I 3x+2y = 8
x-5y = -37. I x3 I 3x-15y = -111
----------------------------------------- -
2y - (-15y) = 8 - (-111)
17y = 119
y = 119 / 17
y= 7
kemudian subsitusi kan
x - 5y = -37
x - (5x7) = -37
x - 35 = -37
x = -37 + 35
x = -2
6x + 4y = 6x(-2) + 4x7
6x+4y = -12 + 28 = 16
semoga bermanfaat