What is the equation of a horizontal line that has a y-intercept of 3?

y = 3

Step-by-step explanation:

The equation of a horizontal line parallel to the x - axis is

y = c

where c is the value of the y - coordinates the line passes through.

here the line passes through (0, 3) with y - coordinate 3

y = 3 ← is the equation of the horizontal line