Answer:
x = (c+a)/2
y = (c-a)/2
Step-by-step explanation:
Add the two equations and you get ...
(x +y) +(x -y) = (c) +(a)
2x = c+a
x = (c+a)/2
--
Subtract the second equation from the first and you get ...
(x +y) -(x -y) = (c) -(a)
2y = c-a
y = (c-a)/2
_____
Comment on this problem
This is what I call a "sum and difference" problem. The solution shown here is (obviously) the generic solution to such a problem. Remembering this can get you quickly to the answer any time you're given the sum of two unknowns and their difference.
The average rate of change on the interval (5, 6) is 9. So the correct option is D.
<h3>
How to find the average rate of change on the interval?</h3>
Here we want to find the average rate of change of f(x), the function on the table, on the interval (5, 6).
This is just:


I we look at the table we see that:



This is a system of equations.
If we subtract the second and first functions, we get:

From that we take two relations:

Now we can replace these two in the last equations so we get:

Now that we know the value of a:

The quadratic equation is:

Evaluating this in x = 6 we get:

And from the table we know that f(5) = 17, then the average rate of change is:

The correct option is D.
If you want to learn more about average rates of change:
brainly.com/question/8728504
#SPJ1
Answer:
This cannot be explained properly by me, but the answer is 4 3/4*1 1/3 divided by (7 1/2-1 1/6). I just did a lot of trial and error
Step-by-step explanation:
-79, -55, 18, 44, 101, 143