Question

what is the pair of numbers that sum to 21 and difference to 5?

Answer 1

Step-by-step explanation:

let 1st no. = X

let 2nd no. = y

sum of no. = 21

x+y= 21

x= 21-y (let us take it as 1st equation.)

now...

their difference = 5

x-y= 5

x= 5+y (let us assume it as 2nd equation.)

now..adding both equations..we get

x+x= 21-y+5+y

2x= 21+5

2x= 26

x= 26/2

x= 13

as we know x-y= 5

putting X = 13

13-y= 5

y= 8

so,pair of no. is 13 and 8

hope it helps..