Question 79938
Hello there,

Don't be intimidated by the variable! Simply substitute what you have as information into the slope formula:

Slope = (y2 - y1)/(x2 - x1)

  -13 = (y - 15)/(4 - 3)

  (y - 15)/1 = -13   <-- I rewrote the equation so it's easier to read.

    y - 15 = -13

Think you can take it from here?