use substitution to solve the following system

Question

2x + 5y + 4z =4

x + 4y + 3z =1

x - 3y - 2x = 5

Answer 1

I will give you a hint.

 

 

From the 3rd equation,

 

x = 5 + 3y + 2z

 

 

Substitute this value of x into the first two equations.  You will then have two equations in terms of only y and z.  From there, you can use either elimination or substitution methods to solve for y and z.  Then once you have the numerical values of y and z, plug them into the 3rd equation to solve for x.