Use the substitution method to solve the system of equations. choose the correct ordered pair. x + y = 11 –x = –y – 9 a.(9, 2) b.(10, 1) c.(11, 0) d.(8, 3)

Sue's average score for three bowling games was 162. in the second game, sue scored 10 less than in the first game. in the third game, she scored 13 less than in the second game. what was her score in the first game?

Which best explains why this triangle is or is not a right triangle ?

Corresponding angles are a. always b. sometimes c. never congruent