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Check if the statement is true (algebraic)

  1. Mar 9, 2013 #1
    1. The problem statement, all variables and given/known data
    I came across this problem in my textbook, i think the answer is wrong. I checked on wolfram alpha and got different results.

    2. Relevant equations

    3. The attempt at a solution
    The solutions in the book are x=2 y=-2, however when I substituted it into the equation i get 2=2+√6
    The answer i got on wolfram alpha is x=2.09974 and y=1.84974, can anyone help confirm that the solution is wrong?
  2. jcsd
  3. Mar 9, 2013 #2


    Staff: Mentor

    So you could solve it by writing two equations in x and y:

    x + y = 2


    x - y = 6

    What do you get?
  4. Mar 10, 2013 #3
    y=-2 and x=4, so the answer in the book is wrong. Thanks, ill have to sort this out with my lecturer.
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