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Math Help - Simultaneous Equations - How to form the equation

  1. #1
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    Simultaneous Equations - How to form the equation

    Juanita saves 20 cent and 50 cent coins in a money jar. After counting her money, she has 299 coins in total which ass up to $94.

    I) Taking x to be the number of 20 cent coins and y to be the number of 50 cent coins, write down two equations in x and y to represent this information.

    Im just struggling trying to form the equation, I can solve it after that.
    I think it would be something like this
    20x + 50y = 299
    20x + 50y = 940

    I was thinking along these lines, Can somebody help?
    But then when you change the signs, you cross out both the x and the y, Its confusing me.
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  2. #2
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    Quote Originally Posted by ZettaDigit View Post
    Juanita saves 20 cent and 50 cent coins in a money jar. After counting her money, she has 299 coins in total which ass up to $94.

    I) Taking x to be the number of 20 cent coins and y to be the number of 50 cent coins, write down two equations in x and y to represent this information.

    Im just struggling trying to form the equation, I can solve it after that.
    I think it would be something like this
    x + y = 299
    20x + 50y = 9400


    ...
    ...and now continue!
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  3. #3
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    forming an equation

    Quote Originally Posted by earboth View Post
    ...and now continue!


    i always find it easier to write the equation in one unknown .If x is the number of 50 cent coins then 299-x equals the 20 cent coins You then write .5x +.2(299-x) =94

    bjh
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