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x + y = 5 --> x = 5 - y ...pers.2
Substitusikan pers.2 ke pers.1
5(5 - y) - y = 13
25 - 5y - y = 13
25 - 6y = 13
- 6y = 13 - 25
- 6y = -12
y = -12/-6 = 2
x = 5 - y
x = 5 - 2 = 3
Titik potong: (x, y) = (3, 2) (B)