3x – 5y = 15 x – 4y = 12 Substitution method

Question

3x – 5y = 15
x – 4y = 12
Substitution method

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Nho 4 years 2021-07-28T11:07:01+00:00 1 Answers 16 views 0

Answers ( )

  1. giabao
    0
    2021-07-28T11:08:17+00:00
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    Answer:

    x=0,y=-3

    Step-by-step explanation:

    3x-5y=15 – equation(1)

    x-4y=12 => x=12+4y -equation (2)

    Replace equation (2) in equation (1)

    3(12+4y)-5y=15

    36+12y-5y=15

    7y=15-36

    7y= -21

    y = -21/7

    y=-3

    If y=-3,then replace in equation (1) ; 3x -5(-3)=15

    3x+15=15

    3x=0

    x=0

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