Question

How do you classify `x + y = 5`?

Answer 1

This is a Linear Equation.

Explanation:

This linear equation represents, graphically, a straight line.
For every value of `x` you get a corresponding value of `y`. These `x` and `y` represent coordinates of points that form a straight line:
write rearranging it as `y=-x+5` and plot it:
graph{-x+5 [-10, 10, -5, 5]}