PRC-2 · Chapter 1 · Question 4 of 45
What are the values of x and y in the following simultaneous linear equations: 2x + 3y = 20 and x + y = 8?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: A) x = 4, y = 4
Explanation
Multiplying the second equation by 2 gives 2x + 2y = 16. Subtracting this from the first equation (2x + 3y = 20) yields y = 4. Substituting y = 4 back into x + y = 8 gives x = 4.
More Linear And Quadratic Equations MCQs
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- Q9Which of the following is the core concept when solving a quadratic equation by completing the square?
- Q10When formulating a linear equation from a word problem, which of the following is the recommended first step?