Math

42=18-4v

I do not understand this AT ALL. If y'all could explain how to do this to me, that would be EXTREMELY helpful. Thank you!

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  1. 42=18-4v

    It's the same as

    18 - 4v = 42
    Subtract 18 from both sides.

    -4v = 24
    Divide both sides by -4
    v = -6

  2. I assume the instructions were to "solve"

    The quest is to isolate the variable on one side of the equation
    and have everything else on the other side, so ....

    42=18-4v
    let's add 4v to both sides
    42 + 4v = 18 - 4v + 4v , resulting in the -4v+4v to cancel out
    42 + 4v = 18
    don't like that 42 on the left side, so
    subtract 42 from both sides
    42 + 4v - 42 = 18 - 42 , the 42-42 on the left cancels out
    4v = - 24
    I don't like the 4 in front of the 4v, would prefer to have just "v"
    The 4 is "connected" to 4v by multiplication, so let's divide both sides by 4
    4v/4 = -24/4

    to get: v = -6

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    posted by Reiny
  3. Thank you so much!

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