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16 September, 21:41

Which choice is the most efficient first step to solve this set of equations? y=3x-5 and 2x+6y=20

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Answers (2)
  1. 16 September, 21:46
    0
    Plug in 3x-5 to the second equation for every y value. (This is substitution)

    2x + 6 (3x-5) = 20

    2x+18x-30=20

    20x=50

    x=2.5

    Then solve the first equation with your x value

    y=3 (2.5) - 5

    y=7.5-5

    Y=2.5

    To check plug the numbers into both

    EQ 1: 2.5=7.5-5

    EQ 2: 5+15=20
  2. 16 September, 21:59
    0
    We substitute the value of y in equation (1) into (2)

    Step-by-step explanation:

    y=3x-5 ... (1)

    2x+6y=20 ... (2)
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