The answer is B. Thank me in the future!
always remember ~Positive Vibes~
From the law of sines, we have

where
is the leg we're interested in,
is the hypothenuse,
is the angle opposite to
, and
is the angle between
and
.
So, in the first case, we can use

And in the second excercise, we use

Step-by-step explanation:
The question is not properly structured but we can as well find the sum of 5/7 and 10 as shown;

Hence the expression written in equivalent form of common denominator is 
The sum is 
Answer:
values of x and y is (4, -2), (0, 0) and (2, 10)
Step-by-step explanation: