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Y-inter = 4
x- inter = 8

Your equation is in y= mx + b form.
So "b" is your y-intercept. So your equation is y= x + 4 
So 4 is in the "b" spot, so 4 is the y-inter.

For x-inter, you can find it by setting the y=0:

0=x + 4           Subtract 4 from both sides
-4 =              divide  for both sides
8 = x 

So your x-inter is 8. 

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Idon’t know this and this isn’t middle school work