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22 December, 23:45

What the answer to this

Solve this system of two linear equations using the linear combination method?

2x-5y=18

y-x=-10

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Answers (1)
  1. 23 December, 01:55
    0
    2x - 5y = 18 ⇒ 2x - 5y = 18

    1x - 1y = 10 ⇒ 2x - 2y = 20

    7y = - 2

    7 7

    y = - 2/7

    2x - 5 (-2/7) = 18

    2x + 1 3/7 = 18

    -1 3/7 - 1 3/7

    2x = 16 4/7

    2 2

    x = 8 2/7

    (x, y) = (8 2/7, - 2/7)
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