Question 675304
2x - 2y = 7
x = y+5
2(y+5) - 2y = 7
2y + 10 - 2y = 7
10 = 7
There is no solution.
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You haven't done anything wrong, the lines don't intersect anywhere, they are parallel with the same slope of 1.
2x-2y = 7 |  2x-7=2y  | {{{highlight_green(y = x-(7/2))}}}
x = y + 5 | {{{highlight(y = x-5)}}}
...
{{{graph(300,200,-10,10,-10,10,x-5, x-(7/2))}}}

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