Write a system of equations that can be used to determine Robin's age, Jay's age and Ann's age.

Question

Robin is twice as old as Jay, Robin is 11 years older than Ann. The total of the ages of Robin, Jay and Ann is 74 years. Use r  to represent Robin's age. Use j to represent Jay's age. Use a to represent Ann's age. Write a system of equations that can be used to determine Robin's age, Jay's age and Ann's age.   

Answer 1

R - 2J = 0

R - A = 11

R + J + A =74

Notice that several coefficients are 1 so that elimination will probably work quickly.