The first equation
2x + 3y + 6z = 12
Answer:

So then we have that Morten Andersen scored on average 97.45 points per year in his career.
Step-by-step explanation:
Assuming the following table on the figure attached.
We see that the career points for Morten Andersen was 2437. That include all the points over alll the years the he played in the NFL.
Since the total years played by Morten Andersen was 25 we can write the following equation:

Where
represent the rate of points average per year.
If we solve for r from the last equation we can divide both sides of the equation and we got:

So then we have that Morten Andersen scored on average 97.45 points per year in his career.
Answer:
30 dogs
Step-by-step explanation:
There are 40 cats, and 25% more cats than dogs. If you find 25% of 40, you get 10. That means there are 10 more cats than dogs. 40-10= 30.
30 dogs.
Equation:
y - 10 = -5x
Solve:
(y - 10) + 10 = (-5x) + 10
y = -5x + 10
Remember the formula (Slope Intercept Form):
y = mx + b
m = Slope (Rise/Run)
b = Y-intercept
So your graph would look something like the attached image:
<em>(Need further elaboration? Let me know!)</em>