Question

A student solved the equation 6s – 10 = 2 + 3s + s and got s = –4. His work shown below is his check for this problem. Which statement best applies to the work shown?
http://media.education2020.com/evresources/2003-03-04-00-00_files/i0170000.jpg
A.

His check does not work, thus s = –4.
B.

The work in his check is all correct, thus s = –34.
C.

The work in his check is all correct, thus s = –4.
D.

His check does not work, thus http://media.education2020.com/evresources/2003-03-04-00-00_files/i0170001.jpg

Answer 1

@robtobey

Answer 2

@DiotropicInventor

Answer 3

@SolomonZelman

Answer 4

Well choice A even without looking at the problem itself is silly, because if the check doesn't work, then s can't be -4.
For B... check is correct, but it doesn't mean that s=-4, because all the check did is ─ proved that `s ≠ -4`
C is also wrong, because the Check worked, but `s ≠ -4`
I would go with D

Answer 5

If I am understanding "check doesn't work" correctly.

Answer 6

thank you

Answer 7

Well that fact of the matter is that s = 6.
For any value of correct value of s, when plugged into the original equation, the LHS has to equal the RHS.