document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=308749>Question 308749</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Which of the following are functions?  The last two problems, i.e., b & c, are multi part relations consider all parts when determining whether or not these relations are functions.  Explain your reasoning for a, b, and c. \r<BR>\n" );
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document.write( "a. f(x) = x + 3\r<BR>\n" );
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document.write( "b. f(x) = 73 if x>2 otherwise f(x) = -1\r<BR>\n" );
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document.write( "c. f(x) = 79if x>0  or  f(x) = -9 if x<0  or  f(x) = 9 or -9 if x = 0\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #220772 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=220772\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The first two are functions. <BR>\n" );
document.write( "For each value of x, you get a unique value of y. <BR>\n" );
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document.write( "However for the third one,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f%28x%29+=+9 ALIGN=MIDDLE  ALT=\"f%28x%29+=+9\"   DISABLED_style= \"max-width:90%; height:auto;\" > or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=f%28x%29=-9 ALIGN=MIDDLE  ALT=\"f%28x%29=-9\"   DISABLED_style= \"max-width:90%; height:auto;\" > if <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+0 ALIGN=MIDDLE  ALT=\"x+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" > fails the uniqueness test.<BR>\n" );
document.write( "Therefore it's not a function.  </SPAN>\n" );
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