document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=812015>Question 812015</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Is triangle ABC with vertices A (-1, 4), B (3, 1), and C (0,-3) a right triangle? Explain your answer.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #488985 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=488985\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> y=mx+b<BR>\n" );
document.write( "slopes<BR>\n" );
document.write( "4-1<BR>\n" );
document.write( "-1-3\r<BR>\n" );
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document.write( "m=-3/4 slope<BR>\n" );
document.write( "3,1<BR>\n" );
document.write( "0,-3<BR>\n" );
document.write( "1--3=4<BR>\n" );
document.write( "3-0=3<BR>\n" );
document.write( "m=4/3 slope<BR>\n" );
document.write( "-3/4*4/3=-1 product of the slopes=-1 so they are perpendicular<BR>\n" );
document.write( "sides AB and BC are perpendicular and form  a right angle. So, yes it is a right triangle\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );