Triangle RST is rotated 90° about the origin to create triangle R’S’T’. Which rule describes this transformation? A (x, y) - (y, -x B (x, y) - (x, -y) C (x, y) - (-x, y) D (x, y) - (-y, x)

answer: 20

step-by-step explanation:

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