document.write( "Question 249783: if the points (3, r) and (r, -1) lie on a line with slope -3/4, wat is the value of r? \n" ); document.write( "
Algebra.Com's Answer #181864 by nerdybill(7384)\"\" \"About 
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if the points (3, r) and (r, -1) lie on a line with slope -3/4, wat is the value of r?
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\n" ); document.write( "Slope between two points on a line:
\n" ); document.write( "m = (y2 - y1)/(x2 - x1)
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\n" ); document.write( "Therefore, we have:
\n" ); document.write( "-3/4 = (-1 - r)/(r - 3)
\n" ); document.write( "Multiply both sides by 4(r-3):
\n" ); document.write( "-3(r-3) = 4(-1 - r)
\n" ); document.write( "-3r+9 = -4 - 4r
\n" ); document.write( "r+9 = -4
\n" ); document.write( "r = -13\r
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