What is the slope of each line?

After you find the slope of each line, take the slope and y-intercept. For example, if the slope was 5 and the y-intercept was a -3 then you would write down 5, -3. After you have your 4 digits (slope of image on left, y-intercept of image on left, slope of image on right, y-intercept of image on right), you are ready to find the letters that will unlock your lock.

You are going to start at the letter a (number 1) in the alphabet. If the digit is 4, it would be the letter d (a (1), b (2), c (3), d (4)). If it's a negative slope, you will go backwards. For example, if your slope is a -3, z (-1), y (-2) and so on.

You will end up with 4 letters that will unlock your lock!!!