1. 5x - 2y = 8 3x + 4y = 10 2. 2x + 5y = 8 5x - 3y = -11 3. 4x + 3y = 1 X + 7y = 8

Jawab :

1. 5x-2y=8 | x 3
3x+4y=10 | x 5
=> 15x-6y=24
15x+20y=50
saya kurangi dari bawah
=> 26y=26
y = 1

substitusi
5x-2(1)=8
=> 5x-2=8
5x= 8+2 => 5x=10
=> x = 2

2.
2x+5y=8 | x5
5x-3y=-11 | x2
=> 10x+25y = 40
10x-6y=-22
dikurangi
31y= 62 => y = 2

substitusi
2x+5(2)=8
=> 2x+10=8
2x= -2 => x= -1

3. 4x+3y=1 | x1
x+7y=8 | x4

=> 4x + 3y = 1
4x + 28y = 32
dikurang dari bawah
25y = 31
y = 31/25
substitusi
4x+3(31/25)=1
4x+93/25=1
4x= 1-93/25
4x= -68/25
x =>-68/25x4
x= -68/100 atau -0,68

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