Answer:

x=29/2

y=21/2

Step-by-step explanation:

Equation 1 : x+y=25

Equation 2 :x-y=4

From equation 2 we can create equation 3

Equation 3: x=4+y

Substitute Equation 3 to equation 1

x+y=25

(4+y)+y=25

4+2y=25

2y=25-4

2y=21

y=21/2 or 10.5

Solve for x

x+y=25

x+(21/2)=25

x=25-21/2

x=29/2 or 14.5

Checking:

10.5 + 14.5=25

14.5-10.5=4

Answer:

Therefore, the numbers are 10.5 and 14.5