Answer:
1)

2) slope is -2/3
Explanation:
1)

2)
when any equation is written as
y = mx + c then m is the slope.
above we have calculated that

which is in the form of
y = mx + c
where m is -2/3 and c is -6
thus slope is m = -2/3
I think the answer is B
A is belong to economics.
C is belong to arts
D is studying the language
The answer is D. All of the above.