write with all steps. Thanks!

Which statement about perfect cubes is true

What are the solutions of the system? y = x^2 + 2x +3y = 4x - 2a. (-1, -6) and (-3, -14)b. (-1, 10) and (3, -6)c. no solutiond. (-1, -6) and (3, 10)

What is the lcm of 16 and 40 ? 24 and 40 ?