A school custodian waxed a gymnasium floor that measured 20 feet by 20 feet. How many square feet did she have to wax?
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We are given a system of equations,
This will translate into a 2x2 matrix of coefficients (because 2 equations and 2 unknowns),
The matrix will then be applied to the vector (lower dimensions on top),
And the result vector will be whats on the other side of equals sign,
So to put everything together,
Hope this helps :)