Question 1040473
2× +7y=9
5×-7y=11


A far better way to indicate those multiplications is to separate the numbers to be multiplied into parentheses groupings.


{{{system(2(7y)=9,5(-7y)=11)}}}


But this is two equations in only one variable.  y MUST have the same value for both equations:
{{{14y=9}}}
{{{y=9/14}}}
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{{{-35y=11}}}
{{{y=-11/35}}}
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.....but it does not have this same value for both.   {{{9/14<>-11/35}}}.