penyelesaian sistem persamaan 2x + 3y =13 dan x -2y = -4 adalah

x - 2y = -4
x = -4 + 2y


2x + 3y = 13
2(-4 + 2y) + 3y = 13
-8 + 4y + 3y = 13
7y = 21
y = 3


x = -4 + 2y
x = -4 + 2(3)
x = -4 + 6
x = 2

x = 2 , y = 3 (b)