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Y-y1 = X-x1
y2-y1 x2-x1
y- 3 = x-1
6-3 4-1
kemudian kali silang
3(y-3) = 3(x-1)
3y-9 = 3x -3
3x-3y+6 = 0
b. x1=-2 ; x2 = 4 ; y1 = 6 ; y2 = -3
Y-y1 = X-x1
y2-y1 x2-x1
y- 6 = x--2
-3-1 4--2
kemudian kali silang
6(y-6) = -4(x+2)
6y-36 = -4x -8
4x+6y-28 = 0
c.x1=-4 ; x2 = -3 ; y1 = 7 ; y2 = -1
Y-y1 = X-x1
y2-y1 x2-x1
y- 7 = x--4
-1-7 -3--4
kemudian kali silang
1(y-7) = -8(x+4)
y-7 = -8x-32
8x+y+25 = 0