If 17xy+7 =19xy ,then 4xy = ?
Correct answer: D. 14
- A. 2
- B. 3
- C. 1/2
- D. 14
Explanation
From 17xy + 7 = 19xy, subtract 17xy to get 7 = 2xy, so xy = 7/2. Therefore, 4xy = 4 × 7/2 = 14. Students may choose a by confusing the coefficient difference, 19 − 17 = 2, with the required value of 4xy.
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