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2014-08-12T21:05:59+08:00
(5x - 2y = 5) x3 -------> persamaan 1
(2x + 3y = 40) x2 -------> persamaan 2

15x - 6y = 15
4x + 6y = 80
6y - 6y + 15x + 4x = 15 + 80
19x = 95
x =  \frac{95}{19}
x = 5

gantikan x,
5(5) - 2y = 5
25 - 2y = 5
-2y = 5 - 25
-2y = -20
y =  \frac{-20}{-2}
y = 10

x = 5 , y = 10
1 5 1