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There are lots of equations that don't form a straight line when graphed; for example:

  • The independent variable occurs in any power other than one, for example: y = x2 or y = x3.
  • The independent variable occurs in the denominator, for example: y = 1/x.
  • If the equation involves some function, in most cases you won't get a straight line, for example: y = sin(x), y = sqrt(x) (i.e., the square root of x), y = ln(x) (the natural logarithm), any other logarithm, etc.
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Q: What is equations that do not from a straight line?
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