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Solve by the substitution method

y=3x-12

2x-3y=-13

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Answers (2)
  1. 4 July, 06:43
    0
    y=3x-12

    2x-3y=-13

    substitute y=3x-12 into 2x-3y=-13

    2x-3y=-13

    2x-3 (3x-12) = - 13

    2x - 9x + 36 = - 13

    -7x = - 49

    x = 7

    y=3x-12 = y=3 (7) - 12 = 21 - 12 = 9

    answer

    solution

    x = 7 and y = 9
  2. 4 July, 06:45
    0
    Y=3x-12 ... (1)

    2x-3y=-13 ... (2)

    substitute y in eqn 2

    2x-3 (3x-12) = - 13

    2x-9x+36=-13

    collect like terms

    36+13=9x-2x

    49=7x

    x=49/7=7

    x=7

    solve for y in eqn 1 where x=7

    y=3 (7) - 12

    y=21-12=9

    y=9
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