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y=-5x+4
maka m= -5
karena sejajar maka m1=m2
jadi y= x^2+7x-8
y'=2x+7
-5=2x+7
2x=-12
x==-6
jadi y=(-6)^2+7(-6)-8
y=36-42-8=-14
PGS melalui titik (-6,-14) gradien m= -5
y+14=-5(x+6)
y+14=-5x-30
y=-5x-44