If x + y = 10 and x – y = 4, what is the value of x * y?
A16
B21
C24
D28
Explanation
Solving: 2x = 14 => x = 7. y = 10 – 7 = 3. x * y = 7 * 3 = 21.
Exam Relevance
- Topic: Algebra
- Subtopic: Linear Equations
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