The easiest way to do this would be to put the equation for y in terms of x.
We have x+y = 6
subtracting x from both sides gives y = 6 - x
This is of the form y = ax + b where b is 6 and a is minus 1.
So the graph will be a line, with gradient minus 1, that crosses the y axis at y=6
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3
X equals 6 ..
7
The graph is a circle with a radius of 6, centered at the origin
x=6=x=5+x=13+x=20 x cannot = x+5. This question has no answer.