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5x - 7y = -25
supaya lebih kita gunakan cara eliminasi untuk mencari nilai x & y
eliminasi x -> 4x + 3y = 23 menjadi 20x + 15y = 115
5x - 7y = -25 menjadi 20x - 28y = -100 -
43y = 215
y = 215/43 => 5
nilai y di subtitusikan ke bawah ini
4x + 3y = 23
4x + 3(215/43) = 23
4x = 23 - 645/43
4x = 989 - 645
43
x = 344/43
4
x = 344/172 => 2
maka,
-3x + 6y = -3 (2) + 6 (5)
= -6 + 30
= 24.