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x - 4y = 10 kali 2
jadi,
2x - 3y = -5
2x - 8y = 20 -
5y = -25
y = -5
2x - 3y = -5
2x - 3(-5) = -5
x = -5 -15 / 2 = -10
3x -7y = 3(-10) - 7(-5) = 5
x-4y=10 |x2| 2x-8y=20
~~~~~~~~ -
5y=-25
y=-5
2x-3y=-5
2x-3(-5)=-5
2x+15=-5
2x=-5-15
2x=-20
x=-10
3x-7y=3(-10)-7(-5)=-30+35=B.5