Question

Use the substitution method to solve the following system of equations.

3x + y – z = 2
2x + y + 2z = 8
2x – 3y + z = 21

Answer 1

does y or z equal a number?

Answer 2

or do u have to solve for a letter?

Answer 3

you have to solve for the letters im pretty sure because it doesnt give me any substitutions for those letters

Answer 4

it's sooo long! :/

Answer 5

i know lol

Answer 6

Substitution means you have to substitute for a letter in one equation using the other equations, as opposed to Elimination.
So get first equation equal to z:
z=3x+y-2 and substitute for z in last two equations.
This method is long a tedious compared to elimination or matrix methods.