Answer:

Step-by-step explanation:
We want to find
given that
and
.
We substitute the functions to get:

We simplify the rational function to get:

However, this function is only defined for 
Answer:
y = 1/4x-1
Step-by-step explanation:
Ok first, you need to find the slope:
0+2 = 2=1
4+4 = 8=4
Slope: 1/4
y=1/4x+b
Now you need to find the y intercept which is b. For that you can take a coordinate pair and substitute it in the equation to find b.
I will use (4,0)
0=1/4 X 4 + b
0=x+b
minus x on both sides. x=1
-1=b
The answer is 4/13 as a faction. It comes out as a long decimal. That can be confusing ;)
0, -1, 1.9,3,15 are irrational numbers