Math

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My equation

Y=4Y+30

I did;

Y-4Y=-3Y

My equation

-3Y=30--->30/-3

I get -10

yet the checking does not work.

Does the negative go on the whole 3Y or just the 3?

  • Math -

    Your solution and answer are actually correct. :)
    Let's do the checking part:
    Y = 4Y + 30
    if Y = -10,
    -10 = -10(4) + 30
    -10 = -40 + 30
    -10 = -10
    Since both sides of the equation are equal, then Y is indeed equal to -10.

    Hope this helps :3

  • Math -

    I don't have to make it positive?

  • Math -

    No, you don't have to.
    30 / 3 = 10
    Here, 10 is positive because both 30 and 3 are positive.
    30 / -3 = -10
    While here, one of them is negative so the answer must also be negative.

    *Note that if however, both 30 and 3 are negative, the answer is positive.

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