Solve the system of equations by finding the reduced row-echelon form of the augmented matrix for the system of equations. x + y - z = -2 2x - y + 3z = 9 x - 4y - 2z = 1

Solving the system of equations by finding the reduced row-echelon form of the augmented matrix for the system of equations, we get:

x = 1, y = -1, and z = 2

Step-by-step explanation:

Please, see the attached file.

Thanks.

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x