Answer:
Step-by-step explanation:
There can be an infinite number of equations that equals 18.
Let us try this as a straight line in a coordinate plane
x+y =18
This solution will be all the points on the line whose x and y coordinates add up to 18
Example:
(1,17)(2,16)(0,18)(-1,19) and so on. i.e. all the points on the line.
