Answer:
3 fish, 2 dogs
Explanation:
You want a point on the grid representing the solution to the relations, Kingston has 5 pets, and the number of fish is 1 more than the number of dogs.
Relations
Each relation can be plotted as a line on the graph:
f + d = 5 . . . . . . . . the total number of pets is 5
f = d + 1 . . . . . . . . there is 1 more fish than dogs
The attached plot shows these lines cross at coordinates ...
(fish, dogs) = (3, 2)
The red circle is the point on the grid that represents the numbers of pets Kingston has.
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Additional comment
The equations are plotted only for their respective practical domains. It makes no sense to plot numbers of pets in a range outside 0 to 5.