Question

Resolva os sistemas:
a) 2x+5y=8
6x+15y=24

b)x-2y=4
3x-6y=6

c)5x+6y=30
10x+12y=60

Answer 1

a) 2x + 5y = 8 ( - 3)
6x + 15y = 24
____________
- 6x - 15y = - 24
6x + 15y = + 24
______________
x = 0

b) x - 2y = 4 ( - 3 )
3x - 6y = 6
_____________
- 3x + 6y = - 12
3x - 6y = 6
___________
x = - 6
c) 5x + 6y = 30 ( - 2 )
10x + 12y = 60
______________
- 10x - 12y = - 60
10x + 12y = 60
_____________
x = 0