Question 1203248
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7x+2y=5
2y=-7x+5
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You show an an equation which you want in some other form, a linear equation.
Not a system.  Just a single equation.


{{{7x+2y=5}}}
{{{2y=-7x+5}}}
{{{(1/2)(2y)=(1/2)(-7x+5)}}}
{{{y=-7x/2+5/2}}}


How you ask about -4  or  -5,  you did not say.  You tell!
The  -4 and th  -5 came from nowhere for no reason.



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How is the graph?

{{{graph(400,400,-4,4,-4,4,-7x/2+5/2)}}}