Answer:
A. y = 1
Step-by-step explanation:
We aren't given a slope but we are given a y-intercept of 1. That's pretty much it. When the line is straight it has no slope so you remove the whole "mx" from slope intercept form.
y = mx + b -> y = b
Since b resembles the y-intercept we can substitute that with 1.
y = 1
Best of Luck!
