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(5, 8) and (-2, 12) 𝑦 = 5𝑥 − 2 3𝑥 − 4𝑦 = 20 Snow is 0.02 m deep after 1 hour and 0.06 m deep after 3 hours. A car is 200 km from its destination after 1 hour and 80 km from its destination after 3 hours. 10 sec 2 miles 15 sec 3 miles The ratio of two variables is constant. Represented: 𝑦 = 𝑘𝑥, 𝑘 ≠ 0 𝑘 is called the constant of variation 𝑘= 𝑦 𝑥 7𝑦 = 3𝑥 2𝑥 − 4𝑦 = 8 5𝑥 − 2𝑦 = 0 8𝑥 +𝑦 =3 Write a direct variation equation for the distance 𝑑 flown in time 𝑡. Graph the equation Estimate how many hours it will take for an airliner to fly 6500 miles. Write an equation that related weight, in pounds on Earth (x) and on Mars (y). Graph the equation Estimate how much a 180 lb man on Earth will weight on Mars. x 4 8 10 y 6 12 15 x -2 1 4 y 3.2 2.4 1.6 Worksheet