document.write( "Question 132226: find the value of r so the line that passes through each pair of the points has the given slope.
\n" ); document.write( "1) (1,4) (r,5), m= undefined \n" ); document.write( "
Algebra.Com's Answer #96608 by nycsharkman(136)\"\" \"About 
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Note that when the line of the graph is vertical the slope is undefined.\r
\n" ); document.write( "\n" ); document.write( "You were given two points:\r
\n" ); document.write( "\n" ); document.write( "(1,4) and (r,5)\r
\n" ); document.write( "\n" ); document.write( "The slope is undefined. This means that the value of r must be a value that produces division by zero, which is not allowed in math.\r
\n" ); document.write( "\n" ); document.write( "What could be the value of r?\r
\n" ); document.write( "\n" ); document.write( "undefined slope = (5 - 4)/(r -1)\r
\n" ); document.write( "\n" ); document.write( "The only answer that makes sense is r = 1. When r is 1, we get a ZERO in the denominator of this fraction, which makes the slope undefined.\r
\n" ); document.write( "\n" ); document.write( "How did I get 1 for r? I set the denominator (r - 1) to zero and solved for r.\r
\n" ); document.write( "\n" ); document.write( "r - 1 = 0\r
\n" ); document.write( "\n" ); document.write( "r = 1\r
\n" ); document.write( "\n" ); document.write( "Got it? Is this clear?
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