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x - 5y = -5 kali 3 = 3x - 15y = -15 -
17y = 8
y = 8/17
x - 5y = -5
x = -5 + 5y
x = -5 + 5 (8/17)
x = -5 + 40/17
x = -85 + 40/17
x = -45/17
maka nilai dari 6x + 4y = 6(-45/17) + 4(8/17)
= -270/17 + 32/17
= -238/17
maaf kalau salah