Himpunan penyelesaian dari 2x + 3y = 13 dan 5x + 6y = 28 Untuk x + y = ...

2x + 3y = 13 |×2|
5x + 6y = 28 |×1|
__________
4x + 6y = 26
5x + 6y = 28
___________-
-x = -2
x = 2

2(2) + 3y = 13
3y = 13-4
3y = 9
y = 3

x + y
= 3 + 2
= 5

X = 2.6, Y = 2.5, 2.6 + 2.5 = 5.1