allerySolve 4x + 2y = 14 and 2x - y = 1. What is y?
A3
B2
C1
D4
Answer & Solution
Correct answer: A. 3
1. Multiply the second equation by 2 to get 4x - 2y = 2.
2. Add it to the first: 8x = 16, so x = 2.
3. Put x = 2 in 2x - y = 1 to get 4 - y = 1, so y = 3.
_Source: Wikipedia, Elementary algebra, Elimination method_
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