When solving the system x + 2y = 9 and x - y = 6, which expression could be substituted for x in the first equation?
9 - x
y - 9/2
9 - 2y
1/2 y + 9

Question

When solving the system x + 2y = 9 and x - y = 6, which expression could be substituted for x in the first equation?
   9 - x 
   y - 9/2 
   9 - 2y 
   1/2 y + 9

anonymous · Answer

9-2y

directrix · Answer

Second Equation: x - y = 6

Substitute for x in the first so solve the second equation for x.

x - y = 6

x = 6 + y 

I don't see 6 + y as an option.

anonymous · Answer

im 100 percent sure its c

directrix · Answer

I am thinking that 9 - 2y is the answer to the following question:

When solving the system x - y = 6 and x + 2y = 9, which expression could be substituted for x in the first equation?

I am wondering if the question is posted correctly.