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x - 4y = 11
x = 11 + 4y
2x + 3y = 0
2(11 + 4y) + 3y = 0
22 + 8y + 3y = 0
8y + 3y = 0 - 22
11y = -22
y = -2
2x + 3y = 0
2x + 3(-2) = 0
2x - 6 = 0
2x = 6
x = 3
3x - y = 3(3) - (-2)
= 9 + 2
= 11
Jadi nilai 3x - y adalah 11.
x - 4y = 11 (kali 2 untuk menghabiskan nilai x )
11y = -22
y = -22/11
y = -2
2x + 3y = 0
2x + 3(-2) = 0
2x + (-6) = 0
2x =0 + 6
2x =6
x = 6/2
x = 3
nilai 3x-y
3x-y = 3(3)-(-2)
= 9 +2
3x-y = 11