Arunner compared how long it took him to run 200 meters to the record time held by a friend. in his first heat, his time was 2.45 seconds greater than his friend's record time. in his second heat, his time was 2 3 8 seconds greater than his friend's record time. in which heat was he fastest? how much less time did he take in that heat than in the other heat?

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x