Question

The following system is solved by substitution. Which expression is substituted for z in the second and third equations?

x + 4y + z = –10
3x – 3y + 6z = –21
x + 2y + 2z = –10

Answer 1

Have you considered solving the first equation for z?

Answer 2

I think tht my hole answer finaliazed shud be –x – 4y – 10

Answer 3

That's it. Do you doubt?

Answer 4

no im pretty sure thts right but wanted to see if anyone else had an input

Answer 5

Good work. Generally, it helps move things along and is generally more beneficial if you just show your work up front.

Answer 6

ya tht is true! thank u!