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The lines x + y = 2, 2x - y = 1 and 3x + ky = 5 meet at one point. What is k?
A1
B2
C3
D5
Answer & Solution
Correct answer: B. 2
The first two meet at (1, 1); putting this into the third gives 3 + k = 5, so k = 2.
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