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5x - 7y = -25 | x4 | 20x - 28y = -100
--------------------------- -
43y = 215
y = 215/43 = 5
4x + 3y = 23
4x + 3(5) = 23
4x + 15 = 23
4x = 23 - 15
4x = 8
x = 8/4 = 2
Nilai -3x + 6y
= -3(2) + 6(5)
= -6 + 30
= 24
5x-7y=-25 | x4 | 20x-28y=-100 -
43y=215
y=215/43=5
4x+3y=23
4x+3(5)=23
4x+15=23
4x=23-15
x=8/4=2
Jadi,
-3x+6y=
-3(2)+6(5)=
-6+30=24