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5x-7y=-25. x4
20x+15y=115 - 20x-28y=-100
43y=215
y=5
4x+3y=23
4x+3(5)=23
4x+15=23
4x=23-15
4x=8
x=2
-3(2)+6(5)
-6+30
24
Maaf ya kalo salah
4x+3=23 |5| 20x+15=115
5x-7y=-25|4| 20x-28y=-100
keduanya dikurangi.. maka
43y=215
y=5
ambil salah satu persamaan awal,
4x+3y=23
4x+3(5) =23
4x=8
x=2
jadi,
-3x+6=-3(2)+6(5)
=24