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5x - 4y = - 1
10x + 2y = 3

5x - 4y = - 1|× 1
10x + 2y = 3|× 2

5x - 4y = - 1
20x + 4y = 6
__________+
25x = 5
x = 1/5

5x - 4y = - 1
1 - 4y = - 1
- 4y = - 1 - 1
- 4y = - 2
y = ½

Jawaban : d. x = 1/5 dan y = 1/2

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