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14 February, 04:42

What is the value o y in the equation 6.4x + 2.8y=44.4, when x=3

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Answers (2)
  1. 14 February, 04:53
    0
    y=9

    Step-by-step explanation:

    I'm going to write this out in equations, let me know if you want it in words too.

    1. 6.4x + 2.8y = 44.4 (subtract 6.4x from both sides to get y alone)

    2. 2.8y = - 6.4x + 44.4 (divide both sides by 2.8)

    3. y = - 2.2857x + 15.8571 (substitute 3 for x)

    4. y = - 2.2857 (3) + 15.8571 (multiply - 2.2857 by 3)

    5. y = - 6.8571 + 15.8571 (finish solving)

    6. y = 9
  2. 14 February, 05:09
    0
    9

    Step-by-step explanation:

    6.4 x 3=19.2

    You move 19.2 to the other side and subtract.

    44.4 - 19.2=25.2

    Then you do 25.2 divided by 2.8 that will give you 9.
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