Algebra: Structure And Method, Book 1 ISBN:9780395977224 Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole Publisher:McDougal Littell
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University of North Bengal One number is 3 less than another number. If the sum of the two numbers is 177, find each number.Step 1:Understand the problemMake sure that you read the question carefully several times.We are looking for two numbers, and since we can write the one number in terms of another number,we will letx = another numberne number is 3 less than another number:x - 3 = one numberStep 2:Devise a plan(translate)The sum of the two number is 177(x-3)+x = 177Step 3:Carry out the plan(solve)*Combine liketermsX-3+x=177*Inv. of sub 3 is add 32x-3 =177*Inv. of mult. 2 is div. 22x-3+3=177+32x=1802x18018022Step 4:Look back(check and interpret)If we add 90 and 87 (a number 3 less than 90) we do get 177. |