Sophie S.

asked • 12/12/19

Rianna thinks that if a=b and if c=d, then a+c=b+d. Is she correct

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Barry M. answered • 12/12/19

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Yes. Substitution on the right side, a for b and c for d gives a+c=a+c, which is an exact identity.


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Barry M.

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Perhaps more formally, we could start with a + c = a + c (identity), then substitute on the right: b for a and d for c, giving a+c=b+d.
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12/12/19

Barry M.

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the right: b for a and d for c, giving a+c=b+d
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12/12/19

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