Gaussian Elimination method

X+Y+2z=6 3X+2Y+Z=9 X-Y=4 Use the system in above. Without interchanging any of the rows in the augmented matrix, what is the first value, which will be replaced with zero when using the Gaussian Elimination method?

Elementary Operations

Use elementary row operations to write the matrix in echelon form.

Solve the system of equations

Solve the system of equations by the Gaussian elimination method.

Gaussian Elimination

Solve the system of equations by the Gaussian elimination method. Which of the following is NOT a matrix leading to the solution?

Matrix

Matrix problem attached

Find the product

Find the product (see attached)

Matrices

When Finding the product how many pairs of numbers must be multiplied together?

Matrices

Matrices problem attached

Algebra help

Solve, find the solution set, solve for the real values - see attachment

Right triangles

How do I find the third angle in a right angle triangle if I know one of the angle's is 65 deg?