Question

Adicao x+y=4
3x+y=28 qual a resposta ??

Answer 1

etapa 1

x+y=4
y=4-x

etapa 2

x+y=28
x(4-x)=28
4-2-y=28
2-y=28-4
2=24:2=12

etapa 3

y=4-x
y=4-x.12
y=4-12
y=8

Answer 2

Resposta:

x+y=4

y=4-x

x+y=28

x(4-x)=28

4-2-y-28

2-y=28-4

2=24:2=12

etapa 3

y=4-x

y=4-x-12

y=4-12

y=8