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6 July, 20:02

Which is the best first step when solving the following system of equations?

x+y=3

4x-y=7

A Multiply the first equation by 4.

B Add the first equation to the second equation.

C Multiply the second equation by Negative 1.

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Answers (1)
  1. 6 July, 20:09
    0
    option B. add the first equation the second, is the answer

    using elimination method,

    x + y = 3 ... (1)

    4x - y = 7 ... (2)

    once you add (1) and (2), the 'y' terms get cancelled, and you get,

    5x = 10

    x = 10/5

    = 2
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Home » Mathematics » Which is the best first step when solving the following system of equations? x+y=3 4x-y=7 A Multiply the first equation by 4. B Add the first equation to the second equation. C Multiply the second equation by Negative 1.
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