System of equations:
• Equation 1

• Equation 2

Procedure
This system is easier if we solve it using the elimination method, in which we multiply the first equation times minus one, add both equations to eliminate the x variable, and solve for y.
0. Multiplying Equation 1 times minus 1.


2. Adding both equations:

Then:

3. Finally, substituting this value in any equation and solving for x:




Answer: y = 9 and x = -5.