Question 580613
3x+2y=13

2x-y=4

d=| 3   2 |
...| 2   -1| 


= 3*-1 -2*2
=-7

Dx= | 13   2|
... |  4   -1|

=-13-8
=-21


Dy= | 3   13|
... | 2  4|

= 12-26

=-14

x=Dx/D = -21/-7
x=3

y=Dy/D = -14/-7=2

x=3, y=2