Solve . What is the value of ?
Answer and explanation
Correct answer: D. 12
- Step 1: Eliminate one unknown by combining the two equations; this gives and .
- Step 2: Check in the first equation: .
- Step 3: Hence .
Answer
12.
Why not the others: 8: that is only the value of . 4: that is only the value of . 44: wrong combination of the solutions.
Practise more Number and Algebra.
Free questions with an explanation for every one, and full timed General Secondary Certificate (Tawjihiya Kuwait) mock tests.
More Number and Algebra questions
- A prize of \90$ is shared by Amy and Ben in the ratio $3:7$. How much does Ben receive?
- A prize of \84$ is shared by Amy and Ben in the ratio $2:5$. How much does Ben receive?
- A prize of \64$ is shared by Amy and Ben in the ratio $3:5$. How much does Ben receive?
- Solve .
- Solve . What is the value of ?
- If and are the roots of , find .