You can use the identity

The sign is negative because the angle is in the 3rd quadrant.
This corresponds to ...
a. -(4√17)/17
The answer is Megan
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I have attached the steps so good luck
If x=2, the equation would be 6 (2) + 3y = 15.
This simplifies to 12 +3y = 15. Subtract 12 from both sides and you get 3y = 3. Divide both sides by 3 and you get y = 1.
So if x = 2, y =1
If x = 5, the equation becomes 6 (5) + 3y = 15.
This simplifies to 30 + 3y = 15. Subtract 30 from both sides and you get 3y = -15. Divide both sides by 3 and you get y = -5.
So if x =5, y = -5.
I hope this helps!