9. it took ryan less time to hike down than it did to hike up. ernest thinks that was because ryan jogged down the same trail he went up. emma thinks the trail down was steeper than the trail up. who is correct and why? include a detailed explanation of why each hypothesis does or does not match the graph.

ernest's hypothesis (jogged down the same trail):

emma's hypothesis (steeper trail):

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]