document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=158089>Question 158089</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have many problems like this one but some are linear,quadratic,cubic,<BR>\n" );
document.write( "well the 1st problem is linear. Y=-2x+1 so we have to graph it and identify the domain and range. I've graphed it but I havent figured out how to find the domain and range. I've tried on other problems...x>0 stuff like that but i dont know if its right. Ive tried going over it a hundred times and even tried looking online on how to identify domain and range...but nothing helps... I'm really struggling with this and 39 other problems just like it. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #116495 by </B><A HREF=/tutors/aboutme.mpl?userid=vleith><B>vleith(2983)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=vleith><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=116495\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The domain is given as all values of x where the function exists. Generally, you look for things that are 'not allowed'. Things like dividing by zero or the square root of a negative number will result in non-real results. So, any value of x that makes things like that happen are excluded from the range.\r<BR>\n" );
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document.write( "In the case of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+-2x+%2B1 ALIGN=MIDDLE  ALT=\"y+=+-2x+%2B1\"   DISABLED_style= \"max-width:90%; height:auto;\" > there are no real value of x that result in a non-real value of y. So, the domain is \"all x\" and the range is 'all y'. That is, there are no invalid answers for this one.\r<BR>\n" );
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document.write( "For the other problems you have, look for things like I noted above. If for instance, you are given <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+1%2Fx ALIGN=MIDDLE  ALT=\"y+=+1%2Fx\"   DISABLED_style= \"max-width:90%; height:auto;\" >, then the when x=0, the value for y is undefined. So the domain there would be \"all x except 0\", and the range would be 'all y'.\r<BR>\n" );
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document.write( "For something like <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+sqrt%28x%29 ALIGN=MIDDLE  ALT=\"y+=+sqrt%28x%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, since you can't have a real square root of a negative number, the range would be \"all x >= 0\". Since square roots can be both negative and poistive, the range is \"all y\".\r<BR>\n" );
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document.write( "Hope this helps </SPAN>\n" );
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