Question

Find an equation of the line having the given slope and containing the given point?
m=-9 (1,3) y=?

Answer 1

y=mx+b
y=-9x+b we know a point on the line (x,y)=(1,3) plug those in and solve for b

Answer 2

y-y1=m(x-x1)

y-3=(-9)(x-1)
y-3=9-x
y=12-x or y=-x+12

Answer 3

y-3=-9(x-1)
y = -9x +9+3
y= -9x+12

Answer 4

Nancy is right... i apparently can't multiply. its -9x, not -x