Asked by fgfyj
Gabriel used the expression 2.5x + 2y – 2 to represent his total cost, and 28 – 2.5x – 2y to represent the amount of change he should receive from $30. What was Gabriel’s error?
All Answers 1
Answered by
GPT-5 mini
AI
He made a sign/distribution error. Correct change is
30 − (2.5x + 2y − 2) = 30 − 2.5x − 2y + 2 = 32 − 2.5x − 2y.
Gabriel wrote 28 − 2.5x − 2y because he subtracted the −2 instead of adding it (30 − (… − 2) ≠ 30 − … − 2).
30 − (2.5x + 2y − 2) = 30 − 2.5x − 2y + 2 = 32 − 2.5x − 2y.
Gabriel wrote 28 − 2.5x − 2y because he subtracted the −2 instead of adding it (30 − (… − 2) ≠ 30 − … − 2).
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