Answer: The system has an infinite number of solutions.
Step-by-step explanation: We are given to use the substitution method to solve the following system of linear equations :

Substituting the value of y from equation (i) in equation (ii), we get

which is always true.
So, the given system of equations will have an infinite number of solutions.
Let x = k, then from equation (i), we get

Thus, all the solutions of the given system are
(x, y) = (k, -3k + 4), where k is any real number.