A physics student solving a physics problem has obtained the following four equations that describe the physics of a system of masses connected: 1. m2 = 3m1
2. --mig cosθ + T= miai
3. a1 = a2
4. m2g-T=m2a2

where g = 9.80 meter/ second^2 and θ = 60° are knowns, and mı, m2, a1, a2, and T are unknowns.

a. The problem requires the student to evaluate which are the unknowns that the student would like to eliminate from the equations?
b. The student decides to eliminate the unknown m2. Which two of the equations can be used to eliminate m2?