Question 895129
Let y be the age of the owner
let x be the age of the pet
Therefore: x+y=13
                 x+3=y-4
then solve for x
x+y=13
x=13-y
x+3=13-x-4
2x=6
x=3
then solve y
y=13-3
y=10
therefore the pet's age is 3years and the owner's age is 10years