Sharon went to solve the following system and her steps are shown.
x - y = 9
x + y = 15
Step One: 2x = 26 Add the systems
Step Two: x = 13 Solve for x
Step Three:
13 + y = 15
y = 2
Solve for y
Was she correct? Justify your answer. If incorrect, describe the error.

Question

Sharon went to solve the following system and her steps are shown.  
x - y = 9
x + y = 15
Step One:	2x = 26	Add the systems
Step Two:	x = 13	Solve for x
Step Three:  	
13 + y = 15   
y = 2
Solve for y
Was she correct?  Justify your answer.  If incorrect, describe the error.

dan815 · Answer

Plug the x and y values into your system of equations to confirm

campbell_st · Answer

well what happens if you add the 2 equations 

 x - y = 9
 x + y = 15
==========
2x       = ?

dbzfan836 · Answer

hmmm, I think x=3

dbzfan836 · Answer

( ͡° ͜ʖ ͡°)

anonymous · Answer

really? @Dbzfan836

triciaal · Answer

no, her method is correct but she made a calculation error
9 + 15 = 24 and not 26