Question

if the sum of 2 number is 21 and their difference is 5 find the number ​

Answer 1

Answer:

X+Y = 21 ---> Y = 21-x

X-y = 5

x - (21-x) = 5

2x - 21 = 5

2x = 26

x = 13

13 and 8

Step-by-step explanation:

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Answer 2

Answer:

13 and 8

Step-by-step explanation:

Let the numbers be x and y respectively.

x + y= 21

x - y= 5

On adding these equations in column (it's easy), we get

2x = 26 (because y-y=0)

x = 13

Now let's go back to equation 1 and substitute the value of x.

13 + y = 21

y = 21 - 13

y = 8

Therefore, the numbers are 13 and 8.