Answer:
y = 6
Step-by-step explanation:
In y=mx+b, slope is represented by m, and y-intercept is represented by b.
If there is 0 slope, only the y-intercept would be present in the equation. Same goes for if you have a slope and the y-intercept is 0, then the slope will be the only one present. (I'll graph all three, so you can see for your self⤴⤴⤴)
Hope this helps :)