Answer: She isn't correct.
Step-by-step explanation: The BODMAS rule must be strictly followed and as such gives different answers to the two expressions.
(12-3)*2 basically gives:
9*2 (Dealing with the bracket first)
18.
While 12-(3*2) while dealing with the bracket first will give:
12-6; which would eventually give
6.
Step-by-step explanation:
==> ac + b = d
==> ac = d - b
==> a = (d - b)/c
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The calculation is incorrect, because the slope is defined as

So, Emma has inverted numerator and denominator: she has calculated the inverse of the slope.
The correct calculation would be

Answer: 7/4
Step-by-step explanation: because you simplify