How many solutions does the system have? You can use the interactive graph below to find the answer.
4x – 10y = –20
6x – 15y = -30

Nikolas calculated the volume of the prism. his work is shown below.

Adele is five years older than timothy. in three years, timothy will be 2/3 of adele’s age. what is adele‘s current age?

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.