WAEC 2010 Mathematics · Question 23
What is the value of x when y = 5? y = x + 1
Options
- A.8
- B.9
- C.10
- D.11
Answer: A. 8
Explanation written with AI and checked against the answer key
Analyze the question: We're given the linear equation y = ½x + 1 and asked to find x when y = 5. Concept: To find an unknown in a linear equation, substitute the known value, then isolate the variable using inverse operations. Solution: Substitute y = 5: 5 = ½x + 1 Subtract 1 from both sides: 5 − 1 = ½x 4 = ½x Multiply both sides by 2: x = 8 Check: ½(8) + 1 = 4 + 1 = 5 ✓ Tip: Always substitute your answer back into the original equation to verify it. It takes only a few seconds and protects you from careless mistakes. Also, when you see a fraction like ½x, multiplying both sides by the denominator (2) is the quickest way to clear it.AI can make mistakes. Report anything that looks wrong.
Past questions © the examination body (JAMB/WAEC/NECO). DeeepSolve is not affiliated with them. Rights holders: see /copyright.