20 points! which ordered pair is a solution to the system of equations? {2x−y=−2 5x−2y=−7 a.(−3, −4) b.(−1, 1) c. (7, −3) d. (2, −6)

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°