Question 1191737
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To start with, put both equations in the form Ax+By=C and simplify.<br>
8x + 64 = 8y
8x - 8y = -64
x - y = -8<br>
-4x + 4y = 32
x - y = -8<br>
The two equations are equivalent; any solution to one equation is a solution to the other.  There is no unique (x,y) solution.<br>
If you want a solution in (x,y) form, then solve the equation for y in terms of x and write the solution parametrically:<br>
x - y = -8
y = x+8<br>
Solution: (x,x+8) where x is any number<br>