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5x+3y=26 x3
15x-10y =135
15x+9y = 78 -
-19y = 57
y = -3
5x+3(-3)=26
5X=35
x=7
5x + 3y = 26 |×3| 15x + 9y = 78
-19y = 57
y = -3
3x - 2y = 27
3x - 2(-3) = 27
3x + 6 = 27
3x = 27 - 6
3x = 21
x = 7
x - 2y = 7 - 2(-3)
= 7 + 6
= 13