Final answer:
The most efficient method to solve a system of equations in slope-intercept form is substitution.
Step-by-step explanation:
When given a system of equations in slope-intercept form, the most efficient method to solve is substitution. Substitution involves solving one equation for a variable and then substituting that expression into the other equation. This allows us to solve for the remaining variable. By substituting the expression, we can avoid graphing the equations and find the solution more quickly.