If this is a homework assignment, please consider trying it yourself first, otherwise the value of the reinforcement to the lesson offered by the homework will be lost on you.
If two number have a difference of 10 and a sum of 34, to determine the two numbers use the simultaneous solution of two equations.
x + y = 34
x - y = 10
Subtract the two equations and simplify
2y = 24
y = 12
Back substitute in either equation
x + 12 = 34
x = 22
Summary
x = 22
y = 12
12 & 22 are the 'missing' numbers.
The two numbers are 10 and 2
The answer to your question is 10 and three.10 + 3 = 13 (Sum)10 - 3 = 7 (Difference)I hope this helps.
10 and 8
26
The two numbers are 10 and 4
9.5 and 0.5 are the two numbers.
The two numbers are 10 and 5
6,4
6 and -4
10 and 6
10 and 5
The numbers are 25 and 15