To eliminate x from the third equation, we add -2 times the first equation to the third equation. The third equation becomes what?

Question

x − y + z = 3

−x + 2y + z = −3

2x + y − 5z = 2

Answer 1

Hey!

Based on what you gave me, we should have this first (after multiplying):

-2x + 2y - 2z = -6 (first equation)

2x + y - 5z = 2. (third equation).

The way to simplify is to simply go from top to bottom, left to right, term by term! (Hint: The x terms will vanish!)

Hope this helps!