AlgebraEasySystem for a sum and a difference
Algebra practice question
Two numbers x and y have a sum of 15 and a difference of 3. Which system of equations describes x and y?
- A. x + y = 15 and x − y = 3Correct
- B. x + y = 3 and x − y = 15
- C. xy = 15 and x − y = 3
- D. x + y = 15 and x + y = 3
Answer: A. x + y = 15 and x − y = 3
Sum is addition, difference is subtraction.
Why the other answers are wrong
- B. x + y = 3 and x − y = 15
- The sum and difference are swapped.
- C. xy = 15 and x − y = 3
- A product is not a sum.
- D. x + y = 15 and x + y = 3
- The same sum cannot equal two values.
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