penyelesaian sistem persamaan linear

x + 2y = 5
x = 5-2y.......(pers 1)

5x + 3y = 4
5(5-2y) +3y = 4
25 - 10y + 3y = 4
-10y + 3y = 4-25
-7y = -21
y = -21/-7
y = 3

x = 5-2y
x = 5-2(3)
x = 5-6
x = -1

2x + 3y =2(-1) +3(3) =(-2)+9 = 7

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