Give an example of a system of three equations in three variables that has (2, -1, 4) as a solution check your answers to show the order triple a solution for all three equations

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?

Does anyone know how to do geometryme with this problem

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?