Edward C. answered 04/01/15
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Caltech Grad for math tutoring: Algebra through Calculus
If you graph these 2 lines you will see that
y = 4 is a horizontal line that goes thru points like (-8,4) and (0,4)
x = -8 is a vertical line that goes thru points like (-8,4) and (-8,0)
The 2 lines intersect at the point (-8,4) which is the solution