Answer:
Step-by-step explanation:
if im correct it should be 100% but if its not then im sorry
This is an ellipse.
Equation of an ellipse: 
Let's find the center point first. We can do this by finding out the midpoint between the vertices or the foci.
(-9+7)/2=-1
Center: (-1,3)
Now we need to find a and b (length along x and length along y).
We know "a". It is the distance between the center and the right or left bound.
a=7-(-1)=8
To find out "b", first see that...
b^2=a^2-(distance from center to foci)^2
foci distance=3-(-1)=4
b^2=8^2-4^2
b^2=64-16
b^2=48
b=4√3
answer: 
The solution is: x= 7 and y = 2
Step-by-step explanation:
Given equations are:

Putting x = 3y+1 in equation 2 from equation 1

Subtracting 1 from both sides

Dividing both sides by 7

Putting y=2 in equation 1

Hence,
The solution is: x= 7 and y = 2
Keywords: Linear equations, substitution method
Learn more about linear equations at:
#LearnwithBrainly
Answer: the standard deviation of the means (D)
Step-by-step explanation:
In order to figure this out, you must solve the equation.
1-6x=7 (given)
-6x=6 (subtract 1 from both sides)
X=-1 (divide both sides by -6)
The answer is no.