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.

2x + 5y – 2z = –1
x + 3y + z = –2
3x – 2y + 3z = –17

Choices:

A)–y = –5
6x + 7y = –11

B)11y = 3
7y + 6z = –11

C)4x + 11y = –5
–11y = –11

D)–y – 4z = 3
–11y = –11

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.

2x + 5y – 2z = –1
x + 3y + z = –2
3x – 2y + 3z = –17

Choices:

A)–y = –5
6x + 7y = –11
		
B)11y = 3
7y + 6z = –11
	
C)4x + 11y = –5
–11y = –11
		
D)–y – 4z = 3
–11y = –11

anonymous · Answer

http://www.wolframalpha.com/input/?i=2x+%2B+5y+%E2%80%93+2z+%3D+%E2%80%931%2C+x+%2B+3y+%2B+z+%3D+%E2%80%932%2C+3x+%E2%80%93+2y+%2B+3z+%3D+%E2%80%9317 Says y =1 so it is C or D Subbing y gives Z = -1 in D So D (this won't help u if u have to do it yourself, though)