~Medal+Fanning~
Henri solved the system of equations below. What mistake did he make in his work?
3x + y = 6
x − 2y = 2

y = 6 − 3x
x − 2(6 − 3x) = 2
x − 12 + 6x = 2
7x − 12 = 2
+ 12 +12
7 x over 7 equals 14 over 7
x = 2

3(2) + y = 6
6 + y = 6
−6 −6
y = 0

He should have substituted 6 + 3x.

He combined like terms incorrectly. It should have been 5x instead of 7x.

He made a mistake in distributing −2.

He made no mistake.

Question

~Medal+Fanning~
Henri solved the system of equations below. What mistake did he make in his work?
3x + y = 6
x − 2y = 2

y = 6 − 3x
x − 2(6 − 3x) = 2
x − 12 + 6x = 2
7x − 12 = 2
     + 12 +12
7 x over 7 equals 14 over 7
  x = 2

3(2) + y = 6
 6 + y = 6
−6        −6 
       y = 0

 He should have substituted 6 + 3x.

 He combined like terms incorrectly. It should have been 5x instead of 7x.

 He made a mistake in distributing −2.

 He made no mistake.

anonymous · Answer

It kind of looks like he is trying to do the elimination method so I can't even say what answer it is :(

anonymous · Answer

he made no mistake

check his answers...(2,0)
3x + y = 6
3(2) + 0 = 6
6 = 6 (correct)

anonymous · Answer

I don't think he made a mistake

anonymous · Answer

Oh ok ! Thanks!

anonymous · Answer

anytime :)