document.write( "Question 344117: please help me solve this linear system ( Three times one number increased by twice a second number is 29. Four times the first less three times the second is 16. Find the numbers \n" ); document.write( "
Algebra.Com's Answer #246301 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! ( Three times one number increased by twice a second number is 29. Four times the first less three times the second is 16. Find the numbers \n" ); document.write( ": \n" ); document.write( "Two numbers, x & y \n" ); document.write( ": \n" ); document.write( "Write an equation for each statement \n" ); document.write( ": \n" ); document.write( "\"Three times one number increased by twice a second number is 29.\" \n" ); document.write( "3x + 2y = 29 \n" ); document.write( ": \n" ); document.write( "\"Four times the first less three times the second is 16.\" \n" ); document.write( "4x - 3y = 16 \n" ); document.write( ": \n" ); document.write( "We can use elimination here, \n" ); document.write( "Multiply the 1st equation by 3, multiply the 2nd equation by 2, \n" ); document.write( "9x + 6y = 87 \n" ); document.write( "8x - 6y = 32 \n" ); document.write( "---------------addition eliminates y, find x \n" ); document.write( "17x = 119 \n" ); document.write( "x = \n" ); document.write( "x = 7 \n" ); document.write( ": \n" ); document.write( "Find y using the 1st equation, replace x with 7 \n" ); document.write( "3(7) + 2y = 29 \n" ); document.write( "21 + 2y = 29 \n" ); document.write( "2y = 29 - 21 \n" ); document.write( "2y = 8 \n" ); document.write( "y = 4 \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "Check solutions in the 2nd equation \n" ); document.write( "4x - 3y = 16 \n" ); document.write( "4(7) - 3(4) = 16 \n" ); document.write( "28 - 12 = 16; confirms our solution of x=7, y=4 \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "How about this, did this make sense to you? \r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |