Answer:
39 and 52
Explanation:
Let x represent one number and y represent the other one
x + y = 91 and
x - y = 13 now add these two equation
x + y + x - y = 91 + 13 add like terms
2x = 104 divide both sides by 2
x = 52 to find y we can subtract this from 91
y = 91 - 52
y = 39