All right angles are congruent.
given: 2x and xy are right angles.
prove: x=xy
proof: 2x and a. ? are right angles because it is given.
by the definition of b. ? ,m_x = 90 and m2y = 90.
by the transitive property of equality, m x = c. ? ,
because angles of equal measure are congruent, d. ? .

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?

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

Solve 2x+y=3 x+y=5 in substitution method