Answer:
The solution is:
Step-by-step explanation:
The Gauss-Jordan elimination method is done by transforming the system's augmented matrix into reduced row-echelon form by means of row operations.
We have the following system:
This system has the following augmented matrix:
To make the reductions easier, i am going to swap the first two lines. So
Now the matrix is:
Now we reduce the first row, doing the following operations
So, the matrix is:
Now we divide L2 by 3
So we have
Now we have:
So, now we have our row reduced matrix:
We start from the bottom line, where we have:
At second line:
At the first line
The solution is:
Answer:
The number is -8
Step-by-step explanation:
Let
x ---> the number
we know that
The algebraic expression is equal to
Solve for x
divide by 6 both sides
I would say the answer is 7, since 21 divided by 3 is 7 and there are 1/3 as many of them