Week 2 quiz error

[Bobbie]

In the week 2 “The Rank of a matrix” quiz the answer for number 2 is incorrect.

The selection “Multiply the first equation by 3 and subtract it from equation 2” should be unchecked. You would have to multiply the first equation by 3 then multiply the second equation by 7. After that you can subtract from the equation.

[TMosh]

I think the answer is correct, because you cannot assume you have to do the operations in the same order they are presented in the answer options.

If there is some possible solution method that uses answer 2, then you should check it.