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m=-15/-5
m=3
sejajar
m1=m2
y-y1=m(x-x1)
y-9=3(x-7)
y=3x-21+9
y=3x-12
2. y-y1=m(x-x1)
y-7=-3/5(x+3)
y=-3/5x-9/5+7
-----------------------kalikan 5
5y=-3x-9+35
5y=-3x+26
3. 3y-8x+24=0
3y=8x-24
y=8/3x-24/3
m=8/3
m1.m2=-1
8/3.m2=-1
m2=-1.3/8
m2=-3/8
y-y1=m(x-x1)
y-9=-3/8(x+2)
y=-3/8x-6/8+9
------------------------kalikan 8
8y=-3x-6+72
8y=-3x+66
4.3y+5y-30=0
3y=-5x+30
y=-5/3x+30/3
m=-5/3
m1=m2
y-y1=m(x-x1)
y-5=-5/3(x+8)
y=-5/3x-40/3+5
-----------------kalikan 3
3y=-5x-40+15
3y=-5x-25