Question

Resolva os sistemas e diga os valores de x e y.

a) (x+2y=11 b) (x+4y=18
(x-y=2 (x-y=3

Answer 1

a)
{x+2y=11
{x-y=2----->×(2)
:
{x+2y=11
{2x-2y=4
------------------(+)
3x=15
x=15/3
x=5

x+2y=11
5+2y=11
2y=11 - 5
2y=6
y=6/2
y=3

s {5 , 3}

b)
{x+4y=18
{x-y=3----->×(4)
:
{x+4y=18
{4x-4y=12
------------------(+)
5x=30
x=30/5
x=6

x+4y=18
6+4y=18
4y=18-6
4y=12
y=12/4
y=3


S={ 6 , 3 }