document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=464355>Question 464355</A>: <I><SPAN STYLE=\"word-break: break-all;\"> For the function f (x) = 7x + 9, determine whether f (x) is one-to-one. If so, find the formula for the inverse and give the domain and range for f -1.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #318122 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=318122\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> For the function f (x) = 7x + 9, determine whether f (x) is one-to-one. If so, find the formula for the inverse and give the domain and range for f -1.<BR>\n" );
document.write( "...<BR>\n" );
document.write( " f (x) = 7x + 9<BR>\n" );
document.write( "By definition f(x) is one-to-one because for each x there is only one y-value.  You can also see this if you note that the function is a straight line.<BR>\n" );
document.write( "..<BR>\n" );
document.write( "To find its inverse, interchange x and y, then solve for y.<BR>\n" );
document.write( "x=7y+9<BR>\n" );
document.write( "7y=x-9<BR>\n" );
document.write( "y=(x-9)/7=f-1<BR>\n" );
document.write( "Domain: all real numbers (-&#8734;,&#8734;)<BR>\n" );
document.write( "Range:also, all real numbers (-&#8734;,&#8734;)<BR>\n" );
document.write( "note that this inverse is also a straight line </SPAN>\n" );
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