Does this have a negative slope c=30-6d

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air

Abox holds 500 paperclips. after a week on the teacher's desk 239 paperclips remained. how many paperclips were used?