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PenguinHelper
If the slope of the red line is one, the slope of the green line is also one. That's because parallel lines have the same slope. 
AL2006
Parallel lines have the same slope, so the blue line's slope is also 1 .

If you didn't know that, you could work out the slope using the 2 points on the line that they gave you. The slope is

(difference in the y-values of the points)
divided by
(difference in their x-values)

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