Write a negotiation of the conditional statement

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

In the picture below, line pq is parallel to line rs, and the lines are cut by a transversal, line tu. the transversal is not perpendicular to the parallel lines. note: figure is not drawn to scale. which of the following are congruent angles?