Question

Solve the following system of equations.

x + y – 4z = –7
2x + 3y – 3z = –6
2x + 2y – z = 0

Answer 1

Matrix

Answer 2

Solve the first equation for x and replace each x in the 2nd and 3rd equations with the result. You now have 2 equations in two unknowns, y and z.

You should verify yourself that {x=3,y=-2,z=2}.

Answer 3

What do you me?

Answer 4

http://www.purplemath.com/modules/systlin5.htm