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21 June, 11:46

X + 2y = 3

3x - 2y = 5

What is the solution to the system of equations?

A) (4, 3.5)

B) (2, 1/2)

C) (2, - 1)

D) (1/2, 2)

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Answers (1)
  1. 21 June, 11:53
    0
    You could plug them all in ... but a faster way:

    add the 2 equations together.

    You would get:

    4x = 8 (the 2y and - 2y cancel out)

    x = 2

    Plug x back into one of the equations.

    x + 2y = 3

    2 + 2y = 3

    2y = 1

    y = 1/2

    So ... B (2, 1/2)
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