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y-(-4)=3(x-0)
y+4=3x y=3x-4
b.m=y2-y1/x2-x1= -1-4/2-1 = -5/1= -5 m=-5
y-y1=m(x-x1)
y-4= -5 (x-1)
y-4= -5x+5
y+5x-4-5=0
y+5x-9=0