Craig scored 12 points in a game. marla scored twice as many points as craig but 5 fewer points than nelson scored. write an expression to represent how many points nelson scored.

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180