Question

sum of two numbers is 15 ,their difference is 7.what r the numbers

Answer 1

Answer:

let x and y be the two numbers

x+y=15 -----(1)

x-y=7-------(2)

adding (1) & (2)

2x=22-----(+y & -y cancel)

therefore x=11

substituting x=11 in (1)

11+y=15

therefore y=15-11

therefore y=4

final answer

x=11 and y=4

Answer 2

Answer:

x=11

y=4

Step-by-step explanation:

x+y=15

x-y=7

x+y=15

+ x-y=7

________

2x=22

so x=22/2=11

11+y=15

so y=15-11=4