If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the second equation.

3x – 5y + z = 12

x + 6y – z = –4

2x – 5y – 2z = –8

Question

If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the second equation. 


3x – 5y + z = 12 


x + 6y – z = –4 


2x – 5y – 2z = –8

campbell_st · Answer

ok... so in the 2nd equation make x the subject... 

x = z - 6y - 4

then substitute this into the 1st and 3rd equation... 

you will now have 2 equations in 2 unknowns...