Without solving, which algebraic method would be the most efficient strategy for the system $\{\begin{array}{c}x=3y-4\\ 7x-2y=10\end{array}$, and why?

Elimination, because the equations are already in standard form

Substitution, because it is the only way to solve for fractional intercepts

Elimination, because the coefficients of $y$ are both negative

Substitution, because the first equation is already isolated for $x$