Question

me ajudem por favor

2x+10y=20
x+y=40​

Answer 1

Resposta:

2x+10y=20

x+y=40

x=40-y

2(40-y)+10y=20

80+20y+10y=20

30y=20-80

30y=-60

y=-60/30

y=-2

x=40-y

x=40-(-2)

x=42