Answer:
I'm going to write both of these because maybe you have a fill in the blank question. I don't know.

Simplify:

Step-by-step explanation:
is the equation of a circle with center (h,k) and radius r.
You are given (h,k)=(4,5) because that is the center.
You are given r=9 because it says radius 9.
Let's plug this in.

Simplify:

I’m not extremely good at math but I think you need to make -x-y=1 into y=mx+b form and then solve your new equation!
5 would be the digit in the tenths place
You need another equation, other wise x can be anything, and y can be infinitely different solutions.
Answer:
Y=2x+4
Step-by-step explanation:
2x-y=-4
subtract 2x
-y=-2x-4
divide by -1
y=2x+4