document.write( "Question 614995: find two numbers such that the sum of twice the first and thrice the second is 92 and four times the first exceeds 7 times the second by 2 \n" ); document.write( "
Algebra.Com's Answer #386902 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! find two numbers \n" ); document.write( "a & b \n" ); document.write( ": \n" ); document.write( "such that the sum of twice the first and thrice the second is 92 \n" ); document.write( "2a + 3b = 92 \n" ); document.write( ": \n" ); document.write( "and four times the first exceeds 7 times the second by 2 \n" ); document.write( "4a = 7b + 2 \n" ); document.write( "4a - 7b = 2 \n" ); document.write( ": \n" ); document.write( "Multiply the 1st equation by 2, subtract from the above equation \n" ); document.write( "4a - 7b = 2 \n" ); document.write( "4a + 6b = 184 \n" ); document.write( "---------------subtraction eliminates a, find b \n" ); document.write( "0 - 13b = -182 \n" ); document.write( "b = \n" ); document.write( "b = +14 is the 2nd number \n" ); document.write( ": \n" ); document.write( "Find the 1st number using the 1st original equation \n" ); document.write( "2a + 3(14) = 92 \n" ); document.write( "2a + 42 = 92 \n" ); document.write( "2a = 92 - 42 \n" ); document.write( "2a = 50 \n" ); document.write( "a = 50/2 \n" ); document.write( "a = 25 is the 1st number \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "Check solutions in the 2nd original equation \n" ); document.write( "4(25) = 7(14) + 2 \n" ); document.write( "100 = 98 + 2; confirms our solutions of a=25 and b=14 \n" ); document.write( " |