Hey!
Let's start by writing the problem:

Subtract 7 from both sides.


Subtact 12x from both sides.


Divide both sides by -10.


Let me know if you have any questions regarding this problem!
Thanks!
-TetraFish
Step-by-step explanation:

An unknown or changeable quantity is called a variable.
Answer:
D. Negative slope
Step-by-step explanation:
Since it is a proportional relation, it must be linear. A line has a slope. Since it is decreasing, it is a negative slope.
The real is B.) f(x) = -x + 11
A.) f(x) = -y + 11 is the wrong answer.
I have pictures to prove that they are the same in the graph as x + y = 11.
Hope this will help a lot more than the other answer.