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f(-2)=7.-2-3
f(-2)=-17
2)'''''......
5x-2y=8
-2y=-5x+8
y=-5/-4
m=5/4
y-y1=m(x-x1)
y+5=5/4 (x-3)
4(y+5)=5(x-3)
4y+20=5x-15
-5x+4y+35=0
4y=5x-35