document.write( "Question 258389: Determine the shortest distance from (9,5) to 5x + 3y =15 \n" ); document.write( "
Algebra.Com's Answer #190225 by richwmiller(17219) You can put this solution on YOUR website! I had to think a second about this one. \n" ); document.write( "They are asking for the equation that for the line which passes through (9,5) and is perpendicular to 5x + 3y =15. \n" ); document.write( "Then we need the intersection of the two lines and then the distance from the intersection to (9,5)\r \n" ); document.write( "\n" ); document.write( "so find the slope of 5x + 3y =15 \n" ); document.write( "3y=15-5x \n" ); document.write( "y=15/3-5x/3 \n" ); document.write( "m=-5/3 \n" ); document.write( "perpendicular slope would be 3/5 \n" ); document.write( "5=3/5(9)+b \n" ); document.write( "25=27+5b \n" ); document.write( "-2=5b \n" ); document.write( "-2/5=b \n" ); document.write( "y=3/5x-2/5 \n" ); document.write( "5x + 3y =15 \n" ); document.write( "5y=3x-2 and \n" ); document.write( "3x-2=5y\r \n" ); document.write( "\n" ); document.write( "3x-5y=2 \n" ); document.write( "5x+3y=15 \n" ); document.write( "9x-15y=6 \n" ); document.write( "25x+15y=75 \n" ); document.write( "34x=81\r \n" ); document.write( "\n" ); document.write( "x = 81/34, y = 35/34 \n" ); document.write( "(9,5) \n" ); document.write( "(81/34,35/34) \n" ); document.write( "a^2+b^2=c^2 \n" ); document.write( "sqrt((9-81/34)^2 +(5-35/34)^2)= \n" ); document.write( "7.7 units\r \n" ); document.write( "\n" ); document.write( "Here are some other ways to do it. Some much shorter. \n" ); document.write( "http://www.worsleyschool.net/science/files/linepoint/distance.html \n" ); document.write( " |