Mathematics for IGCSE & O level - Equations (Section 4 - No. 23)

If you are given the equation 3x - 2y = 6 and y = x - 5, what is the most efficient way to solve this system?

Graphing both equations.

Using the elimination method.

Using the substitution method.

Completing the square.

Since y is already defined in terms of x, substitution is the easiest method.