Question

The sum of two numbers is 8 and their difference is 4.Find the number

Answer 1

Answer:

let the unknown numbers are x,y

given sum of two numbers is 8

x + y = 8

and given difference is 4

x - y = 4

then

x + y = 8

x - y = 4

= 2x = 12

x = 12/2

x= 6

then

x + y = 8

6 + y =8

y = 8-6

y=2

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Answer 2

Let the 1 number= x

Let the second number=y

According to questions

x+y=8 ----------(1)

x-y=4 ------------(2)

by elimination method

Add eq. (1) and (2)

x+y+x-y=8+4

2x=12

x=12/2

x=6

put the value of x in eq. (1)

x+y=8

6+y=8

y=8-6=2

therefore,x=6 and y=2

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