First you'll take 18/2 which equals 9. Then 30/2 which equals 15. Then you can divide both 9 and 15 by 3. So 9/3 equals 3 and 15/3 equals 5. So the answer is 3:5.
It has infinite solution or many solutions.
The steps are on paper.
Theyre equal, adding the zero at the end does not change the value
M = 1 -1 /dx = 0
y = b
y = 1
the line is horizontal ( has one value for y for any given x)