For the following system, if you isolated y in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

2x + y = 8
−x − y = −5

8 + 2x

8 − 2x

−8 − 2x

−8 + 2x

Question

For the following system, if you isolated y in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

2x + y = 8
−x − y = −5 

 8 + 2x 

 8 − 2x 

 −8 − 2x 

 −8 + 2x

cwrw238 · Answer

2x + y = 8
subtract 2x from both sides
y = 8 - 2x
- tags what you substitute into second equation

cwrw238 · Answer

* thats what

anonymous · Answer

What about for this question?

Solve the following system.
  y = x + 4
5x + y = 16 

 (2, −6) 

 (−2, 6) 

 (6, 2) 

 (2, 6) 



would i be doing the same thing? 
I got (2,-6) idk if thats right @cwrw238

cwrw238 · Answer

well plug in x+4 for y in second equation
5x + x + 4 = 16
6x = 12
x = 2
now sub x= 2 into y= x + 4
gives y = 2+4 = 6

(2,6)

nali · Answer

@Reemxoxo do u still need help?