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Post-UTME Mathematics 2015 Objective — Question 1

Question 1 of 40 from the Post-UTME Screening (Post-UTME) Mathematics 2015 Objective paper, with the correct answer and a full explanation.

If x+y=1 and x-y=1, what is y?

A. -1
B. 1/2
C. 0Correct
D. 2

Explanation

Adding the equations: 2x=2, x=1; substituting: 1+y=1, y=0.

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