You are given the system: y = 4x - 3 and 6x + 2y = 20. Which method: substitution or elimination, would be considered the most efficient to solve this system of equations and why?

Elimination; because all the coefficients are even numbers.

Substitution; because the first equation is already isolated for y.

Substitution; because it is the only way to find the x-intercept.

Elimination; because it is always faster than substitution.