Answer:
25%
Step-by-step explanation:
Since we know that the markdown is $20 by subtracting 80-60 , we find out what percent of 20 is 80. To do that you do 20/80, which is 0.25, or 25 percent.
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The value of the y-intercept is (0,7)
So the y intercept is 0,7
The slope/rate of change/growth is 5
(-8--3)/(-2--1)=-5/-1=5