Which equation represents the line that is parallel to y=3 and passes through (-2,8)

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists