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14 February, 11:31

3x - 4y = 18

x + 3y = - 7

+2
Answers (1)
  1. 14 February, 11:49
    0
    x=2, y=-3

    Step-by-step explanation:

    x+3y+-7

    move variable to the right and - 3y from each side

    x+3y-3y=-7-3y

    x = - 7-3y

    3x - 4y=18

    3 (-7-3y) - 4y=18

    solve for y, distribute

    -21-9y-4y=18

    collect like terms

    -21-13y=18

    move constant and change sign

    -13y=18+21

    add

    -13y=39

    divide by - 13

    y = - 3

    substitute

    x=-7-3 (-3)

    solve

    x=2
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