Given the following system of linear equations, Part A: Solve the linear system of equations by graphing.
Part B: Use substitution to solve the linear system of equations.
Part C: Use addition to solve the linear system of equations.
In your final answer, include all of your work, the graph of the equations and the solution.

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Can someone me with the property questions for 12 13 and 14 plz