Given the system of equations 2 x − 3 y − 9 z = 9 x + 3 z = 3 − 3 x + y − 4 z = − 10 (a) determine whether the system is inconsistent or dependent; your answer is (input inconsistent or dependent) dependent correct (b) if your answer is dependent in (a), find the complete solution. write x and y as functions of z .

Dependent

Step-by-step explanation:

We are given that system of equations

(Equation I)

( Equation II)

(Equation III)

Equation III multiply by 3 and then add to equation I then we get

Divided by -7 then we get

Now , obtained equation subtract from equation II then we get

0=0

Hence, equation II is a linear combination of equation I and equation III.

Therefore, system is dependent because system has infinite solutions.

Substitute the value of x in equation I then we get

In order to the get the mean, you will have to add all of the values and then divide your answer by how many values there are. 

Let's add our values: 
78+79+80+80+89+89+92+93+94+95+95+95 = 1059. 

There are 12 values. So...:
1059/12 = 88.25. It says to round to the nearest tenth. That would be 88.3.