1.2x+y=12 dan x+2y=9 2.x+y=4 dan 2x-y=5

jawaban 1

2x + y = 12
x + 2y = 9

4x + 2y = 24
x + 2y = 9
_________ _
3x = 15
x = 5

x + 2y = 9
5 + 2y = 9
2y = 4
y = 2

Jadi, nilai x = 5 dan y = 2

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Jawaban no. 2

x + y = 4
2x - y = 5
__________ +
3x = 9
x = 3

substitusi x = 3

x + y = 4
3 + y = 4
y = 1


Jadi, nilai x = 3 dan y = 1

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