document.write( "Question 134116: Suppose y varies directly as x and that y=21 when x=3. Find the value of y when x=5. \n" ); document.write( "
Algebra.Com's Answer #98083 by jojo14344(1513)![]() ![]() ![]() You can put this solution on YOUR website! By Ratio and Proportion;\r \n" ); document.write( "\n" ); document.write( "1st condition; x=3 and y=21 \n" ); document.write( "2nd condition; x=5 and y=? \n" ); document.write( "so, \n" ); document.write( "3/21 = 5/y \n" ); document.write( "y = 5 * 21 /3 \n" ); document.write( "y = 35\r \n" ); document.write( "\n" ); document.write( "It is just right to be y=35 (as shown by ratio above)as it varies directly to x. \n" ); document.write( "When x goes up, so does y goes up! \n" ); document.write( " |