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23 November, 12:37

Solving System Of Equations by Elimination

1.) - 14 = - 20y - 7x

10y + 4 = 2x

2.) 3 + 2x - 7y = 10x

-3 - 7y = 10x

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Answers (1)
  1. 23 November, 13:02
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    1). On the second equation I subtracted 10y from both sides. So I get:

    -20y-7x=-14

    -10y+2x=4

    I then multiplied the 2nd equation by - 2

    -20y-7x=-14

    20y-4x=-8

    You combine like terms

    -11x=-22

    Divide both terms by - 11

    x=2

    Then plug in x

    -20y-7 (2) = - 14

    -20y-14=-14

    Add 14 on both sides

    -20y=0

    Divide both sides by - 20

    y=0

    So in conclusion:

    x=2 y=0

    2). Add 7y in both equations so I get:

    10x+7y=3

    10x+7y=-3

    So I multiply - 1 on the top side.

    -10x-7y=-3

    10x+7y=3

    Add like terms

    0=0

    No solution is the answer.
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