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R= 4
3x+4y-1=0
4y=-3x+1
y=-3/4+1/4
karena tegak lurus m=4/3
y-b=m(x-a)+r√1+m²
y-2=4/3(x+1)+4√1+16/9
y-2=4/3x +4/3+4√25/9
y-2=4/3x+4/3+4x5/3
3y-6=4x+4+20
3y=4x+30
3y-4x-30=0
atau
3y-6=4x+4-20
3y=4x-10
3y-4x+10=0