Question

Me ensine equação do 1 grau bem exemplificada

Answer 1

x+y=4
2x+2y=8 x=4-y

2x+2y=8
2×[4-y]+2y=8
8-y+2y=8
-y+2y=8-8
y=0

x+y=4
x+0=4
x=4-0
x=4

para confirmar:

4+0=4
4=4

2×4+2×0=8
8+0=8
8=8

PARA SABER O 2× NA SEGUNDA EQUAÇÃO ERA O 2

Answer 2

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espero que tenha ajudado =)