Question

What is the equation of this line? ​

Answer 1

Answer: x = 0

The blue line is vertical. Every point on this line has an x coordinate of 0. Two such points on this line are (0,1) and (0,2). Since every x coordinate is 0, we say the equation is x = 0. The y value doesn't matter.

Answer 2

y=mx+b

y is known as b