How can we prove mathematically : 1+2=4

Question

1. I am always excited
2. I tell people where things are at
3. You can play a game on me
4. I'm very rich
5. I give percentages
6. I am always looking up
7. And.........
8. I look like a light in the sky
9. I keep things arranged that are to my right
10. I keep things arranged that are to my left
    What Are We?

Answer 1

Let suppose x = y
x = y
xy = x*x
xy + x*x = x*x + x*x
xy + x*x = 2x*x
xy + x*x - 2xy = 2x*x - 2xy
x*x - xy = 2x*x - 2xy
1(x*x - xy) = 2(x*x - xy)
1 = 2
1 + 2 = 2 + 2
1 + 2 = 4