SOLUTION: https://gyazo.com/1de7e2e7be35345d7fc5bd3a2ed75cdc can someone please just answer this I need steps too

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Question 1181861: https://gyazo.com/1de7e2e7be35345d7fc5bd3a2ed75cdc
can someone please just answer this
I need steps too

Answer by josgarithmetic(39628) About Me  (Show Source):
You can put this solution on YOUR website!
This was answered two, three , or four days ago already.

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Those are two lines in coordinate plane.
f(x) contains points (-8,0) and (8,4).
g(x) contains points (-1,-7) and (6,7).
Find the equation of each line, or find the expression for each function.
(g-f)(x) means the same as g(x)-f(x). The question asks to find the value at x=4.