Find all solutions by transforming the system to reduced echelon form and back substituting. (if there are an infinite number of solutions use s1 as your parameter. if there is no solution, enter no solution.)

2x1 + x2 = 2

−x1 − x2 − x3 = 4

The system has infinite solutions described in the set

Step-by-step explanation:

The augmented matrix of the system is .

We apply row operations:

1. We add the first row to the second row twice and obtain the matrix

2. multiply by -1 the rows of the previous matrix and obtain the matrix that is the reduced echelon form of the matrix associated to the system.

Now we aply backward substitution:

1. Observe that the reduced echelon form has a free variable, then the system has infinite solutions.

2.

3.

.

Then the set of solutions is

3/4 ÷ 3/4

step-by-step explanation:

basically divide any proper fraction with itself to fit the criteria.

so if we are using 3/4, then:

3/4 ÷ 3/4 = 1

so 1 is the quotient.

and the numerators for both these fractions is 3.   and if we divide the numerators:

3 ÷ 3 = 1

we see that quotient is equal to our original quotient as well.

i just took the test, the correct answer is .. 31.5 in.