Question

Resolva o sistema linear abaixo:
A) X+2y=1
3x-2y=11

B) X-y=1
X+2y=0

C) 3x-2y=1
6x-4y=7

Answer 1

A) x+2y=1 *x+2y=1
3x-2y=11 3+2y=1
__________ 2y=1-3
4x+0 = 12 y=-1
4x=12 S (3, -1)
x= 12/4= 3

B)x-y=1 ×(-1) * x-y=1
x+2y=0 x- 1/3=1
x=1 + 1/3
-x+y=1 x= 4/3
x+2y=0
______ S (1/3, 4/3)
0+3y=1
y= 1/3

C)3x-2y=1 × (-2)
6x-4y=7

-6x+4y=-2
6x-4y=7
________
0x+0y=5 SI