The equation of a vertical line is always written as x = a number.

The equation of a horizontal line is always written as y = a number.

To determine what the number will be, look to see where the line crosses either the x or y axis .
Which equation best represents the line shown on the grid?
a- y=3 undefined slope
b- y=3 zero slope
c-x= 3 undefined slope
d x= 3 zero slope