Answer:
Infinite Solutions
Step-by-step explanation:
No math required since it is Infinite Solutions. :-)
Yes they are equivalent 18:9 simplified by 9 is 2:1
It’s better if you do but now you don’t have to.
Answer:

Step-by-step explanation:
First we must know the format of slope-intercept form!
This is:
(where "m" is the slope and b is the y-intercept)
Given this equation:
we must convert this into the format of slope-intercept form.
First, we should move the "2x" to the other side of the equation, we do this by subtracting -2x from 2x and proceed to move it to the other side.
This would be result in: 
Next, we need to isolate the "y" variable by dividing the 2 off of it.
What you do to one side you do to the other!
-2 / 2 is -1 so this will just be "-x"
20 / 2 is 10
Therefore, our resulting equation will be: 
I hope this helped! Feel free to ask questions if you feel the need!