Answer:
y = 1
Explanation:
Slope = 0 since it is a horizontal line.
y = mx + b is your slope intercept form.
m = slope
b = y-intercept
find b. in other words, when x = 0. We see that when x = 0, y = 1. Therefore, your b = 1.
put together your equation
y = mx + b
y = 0x + 1
therefore, y = 1 is your equation for the line on the graph