document.write( "Question 469624: What is the equation of a line perpendicular to a line that has a slope of -1 and passes through (-3,9)? I don't even know where to start:( I know a perpendicular line has the negative recipricol of the original line's slope (-1). \n" ); document.write( "

Algebra.Com's Answer #322178 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "equation of a line perpendicular to a line that has a slope of -1/1 
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document.write( " New Line:  m = 1
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document.write( "Using the standard slope-intercept form for an equation of a line y = mx + b  where m is the slope and b the y-intercept.  
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document.write( "   y = 1*x + b  |passing through (-3,9)
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document.write( "   9 = -3 +b
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document.write( "  12 = b
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document.write( "Line is:  y = x + 12  \n" );
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