William 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
-5x - 12 = 2
+ 12 +12
-5x=14
---- ----
-5=-5
x = 2.8

3(2.8) + y = 6
8.4 + y = 6
-8.4 -8.4
y = -2.4
Answer

He made a mistake in distributing -2.

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

He made no mistake.

He should have substituted 6 - 3x.

Question

William 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
-5x - 12 = 2
 + 12 +12
-5x=14
----  ----
-5=-5
 x = 2.8

3(2.8) + y = 6
 8.4 + y = 6
-8.4 -8.4
 y = -2.4
 Answer

He made a mistake in distributing -2.

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

He made no mistake.

He should have substituted 6 - 3x.

hero · Answer

He should have substituted 6 - 3x

hero · Answer

What is this? A double post?

anonymous · Answer

SORRY I HAD TO CORRECT IT. LOLLLL.