Search
Ask a question
0

how to set up

the sum of 2 numbers is 21 and the difference is 5?

3 Answers by Expert Tutors

Tutors, sign in to answer this question.
Anahid H. | BSEE, MBA professional will tutor in Excel, Algebra, GMAT,etc.BSEE, MBA professional will tutor in Exc...
0
Let x be the larger number and y be the smaller one. We have two variables and two equations as follows:
 
x+y=21
x-y=5
 
therefore 2x=26 and x=13 and y=21-13=8. The two numbers are 8 and 13.
Bill N. | Bill-Biology (AP and college), Algebra I/II, precalc, geometry, ASVABBill-Biology (AP and college), Algebra I...
4.9 4.9 (196 lesson ratings) (196)
0
let x equal the number you are looking for. The second number the instructions say there is a difference of 5 between these tow numbers and when you add them together you get 21
 
So x= one number
 
and x-5 = second number
 
now, add these together to get 21
 
so
 
(x+x)-5= 21
 
2x-5=21
 
now solve algebraically and you'll have your answer
Leeland C. | Mathematics and English expert through High School level classesMathematics and English expert through H...
0
x+y=21
x-y=5