document.write( "Question 256762: I need help putting this word problem into algabreic formula. \"7 years ago I was 11 times older than my daughter, now I am 4 times older than her, how old am I? \n" ); document.write( "
Algebra.Com's Answer #188816 by nerdybill(7384)![]() ![]() You can put this solution on YOUR website! \"7 years ago I was 11 times older than my daughter, now I am 4 times older than her, how old am I? \n" ); document.write( ". \n" ); document.write( "Let x = your age \n" ); document.write( "and d = your daughter's age \n" ); document.write( "then \n" ); document.write( "from \"7 years ago I was 11 times older than my daughter\" \n" ); document.write( "x-7 = 11(d-7) (equation 1) \n" ); document.write( ". \n" ); document.write( "and from \"I am 4 times older than her\" \n" ); document.write( "x = 4d (equation 2) \n" ); document.write( ". \n" ); document.write( "Solving equation 2 for d: \n" ); document.write( "d = x/4 \n" ); document.write( ". \n" ); document.write( "Substitute the above into equation 1: \n" ); document.write( "x-7 = 11(d-7) \n" ); document.write( "x-7 = 11(x/4-7) \n" ); document.write( "Multiply both sides by 4: \n" ); document.write( "4x-28 = 11(x-28) \n" ); document.write( "4x-28 = 11x-308 \n" ); document.write( "-28 = 7x-308 \n" ); document.write( "280 = 7X \n" ); document.write( "40 years old = x \n" ); document.write( " \n" ); document.write( " |