Question 118723
2x + y = 3
x - 2y = 4

:: if we want the x coordinate, we have to get rid of the y
:: if we multiply the top equation by 2, the y becomes 2y, 
:: which will cancel the -2y in the second equation
top equ * 2:
4x + 2y = 6
:: now the new top equation and the original bottom equation
4x + 2y = 6
x  - 2y = 4
:: add these two equations
5x + 0 = 10
5x = 10
:: divide both sides by 5
x = 2