What is the equation for the following graph?
a. y=-4
b. y=4
c. x=4
d. x=-4

Answer:
x=4
Step-by-step explanation:
Consider the coordinate pair (4,y)
We observe that,
y can take any real values to lie on the graph of the equation.
As y really isn't a constant, we exclude it and take the equation as x=4