Solve the system of equations:

Question

x - y - z = 2
x + 2y - 2z = 3
3x - 2y - 4z = 5

I know how to do the whole process, but sometimes I make careless errors that I never catch when I go over my work. This is the answer I worked out:

x = 5
y = 1
z = 2
could somebody please let me know if I'm correct?

Answer 1

to check if your answers are correct just plug in the values you found into each of the equations.
Make sure they work for all 3 equations, answers might work in one equation but not in the other. In that case you would have made a mistake.

BTW, you are right!

Answer 2

thanks reiny =)