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4x+3y=12 dicari gradien(m)
3y= -4x +12
y= -4/3 ........ m1
karena tegak lurus, maka m2 = 3/4
masukkan ke rumus ini:
y-y1 = m(x -x1)
y-1 = 3/4(x-2)
y-1 = 3/4x - 3/2
y = 3/4x - 3/2 + 1
y = 3/4x - 1/2