document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=394430>Question 394430</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The standard form of a line is 4x+5y=51. Another line passes through points (5,8) and (1,3). Prove whether the second line is parallel or perpendicular to the first line. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #279854 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><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=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=279854\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The slope of the first line is -4/5, if you write the equation in slope-intercept form. The slope of the second line is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%288-3%29%2F%285-1%29+=+5%2F4 ALIGN=MIDDLE  ALT=\"%288-3%29%2F%285-1%29+=+5%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" > which is the negative of the reciprocal of the first line's slope. Hence they are perpendicular. </SPAN>\n" );
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