document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1138899>Question 1138899</A>: <I><SPAN STYLE=\"word-break: break-all;\"> is {(-5, -1), (5, -1), (2, -1)} a function<BR>\n" );
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document.write( "is {(-5, -1), (5, -1), (2, -1)} a function\r<BR>\n" );
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document.write( "Note: <BR>\n" );
document.write( "The function y = f(x) is a function if it passes the vertical line test. It is a one-to-one function if it passes both the vertical line test and the horizontal line test.\r<BR>\n" );
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document.write( "in your case, ordered pairs  represents a function because no matter what input you give it gives the same output \r<BR>\n" );
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document.write( "this kind of function is usually written as <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=a ALIGN=MIDDLE  ALT=\"y=a\"   DISABLED_style= \"max-width:90%; height:auto;\" >, and your is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=-1 ALIGN=MIDDLE  ALT=\"y=-1\"   DISABLED_style= \"max-width:90%; height:auto;\" >, and called a <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=constant ALIGN=MIDDLE  ALT=\"constant\"   DISABLED_style= \"max-width:90%; height:auto;\" > function  </SPAN>\n" );
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