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4 February, 08:12

2x - y = - 1

5x + 4y = 17

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Answers (1)
  1. 4 February, 08:36
    0
    You will need to use simultaneous equations.

    Method:

    Get both equations to have the same subject, in this case we will multiply the first equation by 4

    1) 2x-y = - 1

    Becomes

    1) 8x-4y = - 4

    Then make both equations equal to 4y.

    1) 8x+4 = 4y

    2) 4y = - 5x + 17

    Because they both equal 4y, that means they are equal to each other.

    8x+4 = - 5x+17

    Now solve for x.

    13x = 13

    x = 1

    Now that we have x, we can substitute it back into either equation to get y. I will use equation 1 because it is less complex.

    2x-y = - 1

    2 (1) - y = - 1

    y = 3
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