algebra one

I need help with solving for y and x, for example in a problem like
3/2x- 2y= 20
how do you solve for y or x
how do know what to subtract
I need to know how to do this in order to do substitution
please any help will be appreciated, thanx

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  1. Add 2y to both sides.
    subtract 20 from both sides, and finally, divide both sides by 2.

  2. With only one equation, all you can do is express x in terms of y or y in terms of x. You cannot solve for both simultaneously unless you have a second independent equation.

    For y in terms of x, add 2y - 20 to both sides and you get
    (3/2)x -20 = 2y
    Now divide both sides by 2 and you end up with
    y = (3/4)x - 10

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    posted by drwls
  3. thanks for the help

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    posted by maryanna

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