Solve the system of equations by graphing. x+y=-7, 2x+y=6

Mary spent a total of $323.14 for a party. she spent a total of $200.22 on food, plus an additional $30.73 for each hour of the party. how long was the party?

Use the data on the dot plot to answer the question. how many people read for more than three hours last week? i'm on a unit test review

The average length of a king cobra is 3.7 m. the record length is 1.88 m longer than the average. how long is the record holder?