Description: Sal demonstrates how to solve the system of equations 2x - y = 14 and -6x + 3y = -42 using the elimination method. And we have the system of equations right here. We have 2x minus y is equal to 14, and negative 6x plus 3y is equal to negative 42. If you just add negative y plus 3y, that won't eliminate.*Teacher Advisor is 100% free.