document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=551116>Question 551116</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Plans for a bridge are drawn on a coordinate grid. One girder of the bridge lies on the line y = –9x – 9. A perpendicular brace passes through the point (–1, 7). Write an equation of the line that contains the brace.<BR>\n" );
document.write( "A. y – 1 = –1/9(x + 7)<BR>\n" );
document.write( "B. x – 7 = –9(y + 1)<BR>\n" );
document.write( "C. y – 7 = 1/9( x + 1)<BR>\n" );
document.write( "D. y – 7 = –9(x + 1)\r<BR>\n" );
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document.write( "Write an equation in point-slope form of the line through point J(4, 1) with slope –49(x + 1) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #359497 by </B><A HREF=/tutors/aboutme.mpl?userid=nyc_function><B>nyc_function(2741)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nyc_function><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=nyc_function><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=359497\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Plans for a bridge are drawn on a coordinate grid. One girder of the bridge lies on the line y = –9x – 9. A perpendicular brace passes through the point (–1, 7). Write an equation of the line that contains the brace.<BR>\n" );
document.write( "A. y – 1 = –1/9(x + 7)<BR>\n" );
document.write( "B. x – 7 = –9(y + 1)<BR>\n" );
document.write( "C. y – 7 = 1/9( x + 1)<BR>\n" );
document.write( "D. y – 7 = –9(x + 1) \r<BR>\n" );
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document.write( "The equation we seek, must have a slope that is perpendicular to the slope of the given equation.  The product of perpendicular slopes = -1.\r<BR>\n" );
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document.write( "You were given y = -9x - 9.  The slope for this equation is -9.  What number times -9 will yield -1?  How about 1/9?\r<BR>\n" );
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document.write( "We know that the equation we need to find must have a slope of 1/9.\r<BR>\n" );
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document.write( "We use the slope 1/9 and the given point (-1,7) and plus this information into the point-slope formula.\r<BR>\n" );
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document.write( "y - y1 = m(x - x1)\r<BR>\n" );
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document.write( "y - 7 = (1/9)(x + 1)\r<BR>\n" );
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document.write( "The answer is choice C.\r<BR>\n" );
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