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