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14 April, 03:32

Solve the system by subsitutuon || x - 3y = - 18

5x - 3y = 6

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Answers (2)
  1. 14 April, 05:17
    0
    X=3y-18

    Sub that X=3y-18 into equation 2

    5 (3y-18) - 3y = 6

    15y - 90 - 3y = 6

    15y - 3y = 6 + 90

    12y = 96

    12y/12 = 96/12

    Y = 8

    Then sub y=8 in the first equation

    x - 3 (8) = - 18

    x - 24 = - 18

    x = - 18 + 24

    x = 6

    Therefore the solution is (6,8)
  2. 14 April, 05:24
    0
    y=6.4

    x=5.04

    Step-by-step explanation:

    x=3y-18

    5 (3y-18) = 6

    15y-90=6

    15y=96

    y=6.4

    5x-3 (6.4) = 6

    5x-19.2=6

    5x=25.2

    x=5.04
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