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syarat tegak lurus m1.m2 = -1 maka 1/2.m2 = -1 maka m2 = 1 × -2 = -2
melalui titik (5,1)
y-1 = -2(x-5)
y-1 = -2x+10 maka 2x-10+y-1 = 0
2x + y -11 = 0
a = 1
b = -2
m1 = -a/b
= -1/-2 = 1/2
karena persamaan garis yang dicari tegak lurus dengan garis yang diketahui maka cari m2 sehingga berlaku m1xm2 = -1
m1 x m2 = -1
1/2 x m2 = -1
m2 = -2/1
maka
y- y1 = m2 (x - x1)
y - 1 = -2/1 (x -5)
y(y - 1) = -2 (x -5)
y -1 = -2x +10
y+2x -1 -10 = 0
y +2x -11 = 0