Question 258854
{{{xy=-13}}}
{{{(0)y=-13}}}
No solution. The function is not defined for x=0. 
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{{{xy=-13}}}
{{{(2)y=-13}}}
{{{y=-13/2}}}
(2,-13/2)
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{{{y=7/x}}}
{{{y=7/0}}}
No solution. The function is not defined for x=0. 
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{{{y=7/x}}}
{{{y=7/2}}}
(2,7/2)