exam Maths Puzzle Numerical Ability

I do not know if that is the topic but here are my questions

Solve: 3/8y - 4 = 2

A. -5 1/3
B. 2 1/4
C. 14
D. 16

Solve:
3x-9 = x = 2
A. 2/11
B. 11/2
C. -2
D - 11/2

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exam Other Question

use the facts:
A=|a b|
|c d|,
then

A^-1=1/ad-bc|d -b|
|-c a| to find the inverse of the matrix, if possible. Check that AA^-1=I(base 2) and A^-1A=I(base2 Problem:

Solve for y:
-2x + 4y = 8x + 12

Thanks for helping.