A. 4 (is the only factor for expression -48xyz -24xy +40)
He played 5% if im correct
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In order to find the solution by graphing we need to make two equation with x and y terms
we use Left hand side 4x^2 for first equation and right side x^2 -7 for second equation.
So the equation becomes
first equation 
Second equation 
are the system of equations that can be graphed to find solution
D I believe hope this helped