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y- y1 = m (x-x1) --> x1 dan y1 diambil dari salah satu titik diatas
y-4 = m (x-1)
cari nilai gradien m =
y-4 = -3 (x-1)
y= -3x+3+4
y = -3x+7 --> subtitusikan ke pers garis yang lain
2x-y-3 = 0
2x - (-3x+7) - 3 = 0
2x+3x-7-3 = 0
5x = 10
x = 2,
sehingga y = -3(2)+7
= 1
titik potong (x,y) --> (2,1)
(y - y1) / (y2 - y1) = (x - x1) / (x2 - x1)
(y - 4) / (-2 - 4) = (x - 1) / (3 - 1)
(y - 4) / (-6) = (x - 1) / (2)
2(y - 4) = -6(x - 1)
2y - 8 = -6x + 6
6x + 2y = 14 ----------> 6x + 2y = 14
2x - y = 3 ------------> 4x - 2y = 6
-------------------- +
10 x = 20
x = 2
6x + 2y = 14
6(2) + 2y = 14
12 + 2y = 14
2y = 2
y = 1
jadi titik potong kedua garis ( 2 , 1 )