Question

Resolva os sistemas:
a) {x-3y=1
2x+3y=29

b) {3x+4y=1
3x-3y=0

Answer 1

a)
{x-3y=1
{2x+3y=29
"""""""""""""
3x=30
x=10

x-3y=1
10-3y=1
y=3

S {10,3}


b)
{3x+4y=1
{3x-3y=0(-1)
""""""""""""
{3x+4y=1
{-3x+3y=0
""""""""""""
7y=1
y=1/7

3x+4y=1
3x+4(1/7)=1
3x=1-4/7
3x=3/7
x=3/7÷3
x=3/7×1/3
x=1/7

S {1/7,1/7}