document.write( "Question 720195: how do i know if a line is a function or not? \n" ); document.write( "

Algebra.Com's Answer #441698 by MathLover1(20850) $\"\"$ $\"About$

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The Vertical Line Test-if you have a function, than vertical lines $\"hit\"$ the graph $\"once\"$ \r
\n" ); document.write( "\n" ); document.write( "The vertical Line test is a way to determine whether or not a relation is a function. The vertical line test simply states that if a vertical line intersects the relation's graph in more than one place, then the relation is a $\"NOT\"$ a function.\r
\n" ); document.write( "\n" ); document.write( "The vertical line test is simply a restatement of the the definition of a function which states that $\"every\"$ $\"x\"$ value $\"must\"$ have a $\"unique\"$ $\"y\"$ value. \r
\n" ); document.write( "\n" ); document.write( "If any particular $\"x\"$ value has $\"more\"$ than $\"one\"$ $\"y\"$ value, then you can pass a vertical line will intersect with the graph of the relation $\"more\"$ than $\"once\"$ .\r
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