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patriot [66]
3 years ago
5

What was gabriel error

Mathematics
1 answer:
Pavlova-9 [17]3 years ago
7 0

The change is given by the difference between how much you paid and how much you actually had to pay. For example, if you pay with a $50 bill and you had to pay $13, your change will be 50-13 = 37 dollars.

In this case, we have

30 - (2.5x+2y-2) = 30-2.5x-2y+2 = 32-2.5x-2y

So, Gabriel's mistake was to leave the negative sign to the "-2" at the end of the expression, instead of flipping it to positive "+2" when subtracting it.

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