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Jawab4x + 7y = 15 ....}kali2
-9x + 14 y = - 4
8x + 14y = 30
-9x + 14y = - 4....(-)
17x = 34
x = 2
4x + 7y = 15
4(2) + 7y = 15
7y = 7
y = 1
titik potong (x,y)=(2,1)
Tegak lurus dengan 21 x + 5y = 3
5x - 21 y = 5(2) - 21(1)
5x - 21y = -11
5x - 21 y + 11 = 0