1. (2,-1) (-5,3)
2. (-4,3) (-3,4)
3. (8,1) (2,6)
4. (13,-3) (5,6)
5. (20,-5)
6. (-9,1) (7,8)
7. 36x + -4y = 4
8. 12x + 3y =-6
9. 5x + 10y =20
10. 2x + 2y =4

hallar la pendiente e interceptó en y.