Question 82923
find an equation that goes through (4,0) and (4,4) 
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slope = [4-0]/[4-4] = 4/0
This indicates the graph has an infinite or undefined slope; it is a vertical line.
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Since it passes through two points where x=4 it will pass through all the points
where x=4.
EQUATION:
x=4
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Cheers,
Stan H.