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10 July, 04:40

Use linear combination. To solve system

-2x+7y=10

X-3y=-3

+4
Answers (2)
  1. 10 July, 04:54
    0
    -2x + 7y = 10 ⇒ - 2x + 7y = 10

    x - 3y = - 3 ⇒ - 2x + 6y = 6

    y = 4

    -2x + 7 (4) = 10

    -2x + 28 = 10

    -28 - 28

    -2x = - 18

    -2 - 2

    x = 9

    (x, y) = (9, 4)
  2. 10 July, 04:54
    0
    So

    use elimintation

    multily second equation by 2

    2x-6y=-6

    add to first equation

    2x-2x+7y-6y=10-6

    y=4

    subsitute

    x-3 (4) = - 3

    x-12=-3

    add 12 to both sdies

    x=9

    x=9

    y=4
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