Answer: The required solution is (x, y) = (0, -5).
Step-by-step explanation: We are given to solve the following system of equations by the method of substitution or elimination :

We will be solving the given system by substitution method.
From equation (ii), we have

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

From equation (iii), we get

Thus, the required solution is (x, y) = (0, -5).