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x + 3y = 10 →×2→ 2x + 6y = 20
---------------------------- ·
-5y = -8
y = -8 ÷ -5
y = 1,6
x + 3y = 10
x + 3(1,6) = 10
x + 4,8 = 10
x = 10 - 4,8
x = 5,2
jadi himpunan penyelesaiannya {5.2 , 1.6]