The formula for the area of a square is A=s^2, where s is the length of one side. Rearrange the formula to solve for s
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ANSWER
The solution is
EXPLANATION
We want to solve the simultaneous equations
and
.
We substitute equation (2) in to equation (1), to obtain
This has now become a linear equation in a single variable .
We solve for x by grouping like terms.
We divide through by negative 3 to get;
.
Hence, the solution is