Algebra 1 (Reiny or Kuai)
posted by Anonymous .
Can a linear equation represent a function if the straight line does not cross any lines of the graph?

Algebra 1 (Reiny or Kuai) 
Reiny
not 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 yaxis
and all horizontal lines are functions
if a line is vertical, then it must cross the xaxis, 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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