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y-2/7-2=x-(-2)/2-(-2)
y-2/5=x+2/4
kalikan silang
4(y-2)=5(x+2)
4y-8=5x+10
4y=5x+10+8
4y=5x+18 atau -5x+4y-18=0
2. y-4x+1=0
y=4x-1
Gradiennya = 4
3. x-5y+8=0
-5y=-x-8
y=-x-8/-5
y= 1/5x+8/5
Gradiennya = 1/5