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x-2y+10=0
2y = x+10
y = 1/2 x +5 (ingat y=mx+c)
m1 = 1/2
karena tegak lurus maka
m1 x m2 = -1
1/2 m2 = -1
m2 = -2
persamaan garis
y-y1 = m(x-x1)
y-(-7) = -2(x-3)
y = -2x +6 -7
y = -2x -1