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m1.m2 = -1 // -1/5.m2 = -1 // m2= 5
y-y1 = m2 (x-x1) // y-2 = 5(x-0) // y-2 = 5x-0
5x -y +2 =0 (Pers. garis)
tegak lurus maka m=5 melalui (0,2)
gunakan rumus. y-b=m(x-a)
y-2=5(x-0)
y=5x+2