Bantu kak,sekalian caranya ya...

2x + 3y = 13. |x2| 4x + 6y = 26
-5x - 2y = -38 |x3| -15x - 6y = -114. +
- 11x= -88
x = 8
2(8) + 3y = 13
16 + 3y = 13
3y = -3
y = -1
x = a-1
8 = a-1
8 + 1 = a
9 = a
y = b + 3
-1 = b + 3
-1 - 3 = b
-4 = b
a + b
= 9 - 4
= 5