Question 39
Algebraic ExpressionsGiven that 3a − 2b = 12 and a + 5b = −13, find the value of (4a − b)
- A.13
- B.7
- C.11
- D.4
Show the answer and explanation
Answer: C (11)
Explanation
From the second equation a = −13 − 5b; substituting gives −39 − 17b = 12, so b = −3 and a = 2. Then 4a − b = 8 + 3 = 11.