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About using Mathematica 5

  1. Sep 29, 2007 #1
    When i input "Solve[{ax + by == 0, cx + dy == 1}, {x, y}]", the machine answered "{{}}", the answer is not what i want, i want to know if my mathematica 5 has some problems.
  2. jcsd
  3. Sep 30, 2007 #2
    Make sure you put a space between the factors like e.g. the "a" and the "x" in "a x". Otherwise Mathematica will see a variable "ax" which is not the same as "a" times "x"
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