To determine the solution:
Subtract the equations
1.
x+4y=16
- 5x+4y=0
2.
x-5x+4y-4y=16-0
3. Combine like terms
-4x=16
4. x=16/-4
5. x= -4
Replace the x to find the value of y. (you can choose which equation to do it with)
1. x+4y=16
2. (-4)+4y=16
3. 4y=20
4. y=20/4
5. y=5
x=-4, y=5
