Question

Q1.sum of two number is 15 , their differnce is 7. What are the numbers?​

Answer 1

Explanation:

Given

we have given that sum of two numbers is 15 and their difference is 7.

To find

we have to find the numbers

$\sf\huge {\underline{\underline{{Solution}}}} </p><p>Solution$

Since, we don't know the numbers let us assume some Variable for numbers

let the numbers be x and y

According to the question:

x+y= 15[ sum]----------(1)

x-y= 7[difference]-----(2)

Add Equation 1 and 2

=> x+y + x- y = 15+7

=> 2x= 22

=> x= 22÷2

=>x= 11

Now,find y

x+y= 15

=>11+y= 15

=> y= 15-11= 4

y= 4

Check:

sum of two numbers is 15: 11+4= 15

difference is 7: 11-4= 7

Answer 2

Answer:

Explanation:x + y = 15

- x - y = 7

2y = 8

2y/2 = 8/2

y = 4

x + 4 = 15

x + 4 - 4 = 15 - 4

x = 11

check

11 + 4 = 15

15 = 15

11 - 4 = 7

7 = 7