document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=100179>Question 100179</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I can't understand\r<BR>\n" );
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document.write( "Which strategies could be used for solving the following system of equations? \r<BR>\n" );
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document.write( "2x + y = 4 \r<BR>\n" );
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document.write( "x - y = 2 \r<BR>\n" );
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document.write( "a. Graph both equations on the coordinate plane and find the point of intersection. <BR>\n" );
document.write( "b. Solve the first equation for y and then substitute that expression into the second equation. <BR>\n" );
document.write( "c. Add the two equations together resulting in an equation with one variable. <BR>\n" );
document.write( "d. a, b, and c are all correct </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #72955 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=72955\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> All three are correct. You're looking for the (x,y) coordinates<BR>\n" );
document.write( "of the intersection of 2 straight lines. All these methods will find that intersection, for example,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2x+%2B+y+=+4 ALIGN=MIDDLE  ALT=\"2x+%2B+y+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+4+-+2x ALIGN=MIDDLE  ALT=\"y+=+4+-+2x\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now substitute in the 2nd equation<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+-+%284+-+2x%29+=+2 ALIGN=MIDDLE  ALT=\"x+-+%284+-+2x%29+=+2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+-+4+%2B+2x+=+2 ALIGN=MIDDLE  ALT=\"x+-+4+%2B+2x+=+2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3x+=+6 ALIGN=MIDDLE  ALT=\"3x+=+6\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+2 ALIGN=MIDDLE  ALT=\"x+=+2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now substitute <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+2 ALIGN=MIDDLE  ALT=\"x+=+2\"   DISABLED_style= \"max-width:90%; height:auto;\" > back in the 1st.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2A2+%2B+y+=+4 ALIGN=MIDDLE  ALT=\"2%2A2+%2B+y+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4+%2B+y+=+4 ALIGN=MIDDLE  ALT=\"4+%2B+y+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+0 ALIGN=MIDDLE  ALT=\"y+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So, the 2 lines intersect at the point (2,0) </SPAN>\n" );
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