document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=982010>Question 982010</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 4x-y=5  4x+4y=-4 solve the linear system using subtraction </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #602882 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52788)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=602882\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \r<BR>\n" );
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document.write( "You have a linear system of two equations in two unknowns\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%284x-y=5%2C+%0D%0A4x%2B4y=-4%29 ALIGN=MIDDLE  ALT=\"system%284x-y=5%2C+%0D%0A4x%2B4y=-4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "Subtract the second equation from the first one. &nbsp;You will get a single equation in one unknown\r<BR>\n" );
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document.write( "-y - 4y = 5 - (-4), &nbsp; or\r<BR>\n" );
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document.write( "-5y = 5 + 4,  &nbsp;or\r<BR>\n" );
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document.write( "5y = -9.\r<BR>\n" );
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document.write( "Hence, &nbsp;y = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-9%2F5 ALIGN=MIDDLE  ALT=\"-9%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" > = -1.8.\r<BR>\n" );
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document.write( "Now, &nbsp;substitute this value of &nbsp;<B>y</B>&nbsp; into the first equation of the original system. &nbsp;You will have \r<BR>\n" );
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document.write( "4x - (-1.8) = 5, \r<BR>\n" );
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document.write( "4x = 5 - 1.8,\r<BR>\n" );
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document.write( "4x = 3.2,\r<BR>\n" );
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document.write( "x = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3.2%2F4 ALIGN=MIDDLE  ALT=\"3.2%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 0.8.\r<BR>\n" );
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document.write( "<B>Answer</B>. &nbsp;x = 0.8, y = -1.8.\r<BR>\n" );
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