document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=942581>Question 942581</A>: <I><SPAN STYLE=\"word-break: break-all;\"> write an exponential function y=ab^x with (-1,8 1/3) and (2, 1.8) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #574631 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=574631\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> write an exponential function y=ab^x with (-1,8 1/3) and (2, 1.8)<BR>\n" );
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document.write( "Form: y = ab^x<BR>\n" );
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document.write( "Solve for a and b<BR>\n" );
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document.write( "1.8 = ab^2<BR>\n" );
document.write( "25/3 = ab^-1<BR>\n" );
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document.write( "Divide and solve for \"b\"::<BR>\n" );
document.write( "0.216 = b^3<BR>\n" );
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document.write( "b = 0.6<BR>\n" );
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document.write( "Now solve for \"a\"::<BR>\n" );
document.write( "1.8 = a*0.6^2<BR>\n" );
document.write( "1.8 = a*0.36<BR>\n" );
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document.write( "a = 5<BR>\n" );
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document.write( "Ans: y = 5*(0.6)^x<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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