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7x + 3y - 2 = 0
7x + 3y = 2

2x - y + 15 = 0
2x - y = -15

Eliminasikan
7x + 3y = 2  (x1)
2x - y = -15  (x3)
-----------------------
7x + 3y = 2
6x - 3y = -45
---------------------- +
13x = -43
x = -43/13
x = - 3 4/13

7x + 3y = 2
7(-43/13) + 3y = 2
-301/13 + 3y = 2
3y = 2 + 301/13
3y = 327/13
y = 327/39
y = 8 15/39

titik potong [tex](-3 \frac{4}{13} , 8 \frac{15}{39}) [/tex]