Solve the system x + y = 7 and x − y = 1.
Answer and explanation
Correct answer: D. x = 4 and y = 3
- Step 1: Add the equations: 2x = 8, so x = 4. Step 2. Then y = 7 − 4 = 3. Answer: x = 4, y = 3. Why not the others: Check x − y = 1: only (4, 3) satisfies both equations.
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