Two rovers are exploring a planet. The system of equations below shows each rover's elevation y at time x. Without graphing these equations, what conclusion can you make about the system of equations? Use pencil and paper. Interpret your result in the context of the problem.
y=1.4x-8
3y=4.2x-24

Lilianna uses 3/4 calories per minute just by sitting. she uses 1 more calorie per minute by walking. lilianna uses a total of 12 1/4 calories walking to the park. lilianna uses the equation, d(.75+1)=12.25 to represent the situation. what does the variable d represent in the equation?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

The function below show how much jayna and hannah charge for babysitting. which statement best compares the two plants?