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x - 3y = 5 => dikali 2 => 2x - 6y = 10
2x + y = 3
2x - 6y = 10
___________-
7y = -7
y = -1
2x + y = 3
2x + (-1) = 3
2x = 3 + 1
2x = 4
x = 2
NILAI 3x + 2y :
3x + 2y
= 3*2 + 2*(-1)
= 6 + (-2)
= 4
Jadi, nilai 3x + 2y adalah 4