document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=379387>Question 379387</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Explain why the vertical line test is used to determine if a graph represents a function? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #269418 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=269418\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A relation is considered a function if every x-value maps to at most one y-value. For example, the equation y = sin(x) is a function, but x^2 + y^2 = 1 is not, since a vertical line at x equals, say, 0, would pass through two of the points. For a relation to be a function, any vertical line drawn must not cross more than one point on the domain/range. </SPAN>\n" );
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