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September 23, 2014

September 23, 2014

Posted by **Anonymous** on Thursday, November 14, 2013 at 10:56pm.

- Algebra 1 (Reiny or Kuai) -
**Reiny**, Thursday, November 14, 2013 at 11:35pmnot sure what you mean by "any lines of the graph", are you talking about the x or y axes ?

if a line is horizontal, then it must cross the y-axis

and all horizontal lines are functions

if a line is vertical, then it must cross the x-axis, it is NOT a function

any other straight line must cross both the x and the y axes, and it would be a function

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