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2x+3y = 0 [ x1 ]
x - 4y = 11 [ x2 ]
jadinya
2x +3y = 0
2x - 8y = 22 -
11y = -22
y = -2
skrg nyari x nya... pilih salah satu persamaan-nya
sya pake yg pertama
2x + 3y = 0
2x + 3(-2) = 0
2x -6 = 0
2x = 6
x = 3
maka nilai 3x - y adalah:
⇔3(3) - (-2)
⇔9 + 2
⇔11