2+2 = 2*2 = 2^2 all simplify to 4. But there is no special name for the three expressions.
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Equivalent expressions.
you test it by giving the letters a value say if X equals 5 and Y equals 7 then you calculate both expressions with that value. If both answers are the same, then the simplified expression is correct, or an equivalent.
Because it is proportionally the same value.
If both equations can be simplified to the same value, they are equal.
You can replace a variable with an equal value or expression. Just make sure the same variable always gets the same value or expression.