Question

resolva os sistema da equaçao do 1 grau com incognita
1) 2x +y=5
x-y=1
2) x+y=1
4x+7y=10

Answer 1

Resposta:

1) 2x+y=5

x-y=1

3x=6

x=6

3

x=2

2) x+y=1

x=1-y

4x+7y=10

4(1-y)+7y=10

4-4y+7y=10

4+3y=10

3y=10-4

3y=6

y=6

3

y=2

x+y=1

x+2=1

x=1-2

x=-1