Question 754179
gradient = y2 - y1/x2 - x1
         = 5 - 3/-1 - 0
         =   2/-1
         = - 2
Using y - b = m(x - a)  with m (gradient) = -2
                        and coordinates (-1,5)

      y - 5 = -2(x -(-1))
      y - 5 = -2x - 2
          y = -2x - 2 + 5
          y = -2x + 3

Hope this helps
:-)