cara menentukan himpunan penyelesaian 5x + 2y=10 dan 3x +4y=12

5x + 2y = 10 | x2 | 10x + 4y = 20
3x + 4y = 12 | x1 | 3x + 4y = 12
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7x = 8
x = 8/7

5x + 2y = 10
5(8/7) + 2y = 10
40/7 +2y = 10
2y = 70/7 - 40/7
2y = 30/7
y = 30/7 x 1/2
y = 30/14
y = 15/7