Given point is   and slope(m) = 9.

Because you know the slope and a point on the line,

Use point - slope form to write an equation of the line.

Let =  and slope(m) = 9.

                  (Substitute 13 for ,8 for and m = 9)

Rewrite in slope - intercept form.

            (Apply distributive property: )

                   (Multiply: )

Apply addition property of equality: If a = b then a + c = b + c.

   (Add 13 to each side)

             (Apply additive inverse property: )

                   (Apply additive identity property: )

                           (Add: )

The equation of the line is  .