document.write( "Question 173947: I need help finding the slope of a line containing the point (1,-3) and perpendicular to y=-3. The worksheet says the answer is 1, but I don't understand how. The other one I am confused with is a line containing the point (-1,6) and perpendicular to x=-1. I don't know how the worksheet got y=6. \n" ); document.write( "
Algebra.Com's Answer #128841 by stanbon(75887)\"\" \"About 
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I need help finding the slope of a line containing the point (1,-3) and perpendicular to y=-3.
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\n" ); document.write( "Draw the line y = -3.
\n" ); document.write( "Plot the point (1,-3).
\n" ); document.write( "The slope of y = -3 is zero.
\n" ); document.write( "The slope of any line perpendicular to it is \"undefined\", not 1.
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\n" ); document.write( "The worksheet says the answer is 1, but I don't understand how.
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\n" ); document.write( "Comment: The \"1\" probably means the equation of the line perpendicular
\n" ); document.write( "to y = -3 and passing thru the point (1,-3) is x = 1.
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\n" ); document.write( "\n" ); document.write( "The other one I am confused with is a line containing the point (-1,6) and perpendicular to x=-1. I don't know how the worksheet got y=6.
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\n" ); document.write( "Draw the line x = -1 and plot the point (-1,6).
\n" ); document.write( "The equation of a line perpendicular to x = -1
\n" ); document.write( "passing thru the point (-1,6) must have a y-value
\n" ); document.write( "of 6. The line in fact passes thru all the points
\n" ); document.write( "where y = 6. It's equation is therefore y = 6.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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