For this case we have that by definition, the subtraction property of equality establishes that having an equality, any number that is subtracted from one side of it, must be subtracted from the other side.
We have:
So, for it to be fulfilled:
We must subtract "20" on both sides of the equation:
Answer:
subtraction property of equality
Solving the system of equations shows that to make these equations true x=1 and y=0.5
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A. I am pretty sure that is right