A line passes through the point 2,1 and has a slope of -4. Write an equation for this line

Answer 1

y-y₁ = m(x-x₁) m = slope, y₁ = reference point y coordinate x₁ = reference point x coordinate

y-1 = -4(x-2) or y = -4x + 8 + 1 =-4x +9

So

y = -4x + 9