Question

write down 2 numbers with a sum is 9 and difference of 1​

Answer 1

Answer:

5 and 4 are the two number

Answer 2

Step-by-step explanation:

Let the two numbers be

x

and

y

x

−

y

=

1

x

+

y

=

9

Solve for

x

in the first equation

x

=

1

+

y

Substitute

1

+

y

instead of

x

in the second equation

(

1

+

y

)

+

y

=

9

1

+

2

y

=

9

2

y

=

8

y

=

4

Substitute

y

in any of the equations

x

+

y

=

9

x

+

4

=

9

x

=

5

The two numbers are

5

and

4