Question

2×+y=20 x-y=1 equação
Me ajudem pvfr

Answer 1

{x−y=1x+y=20

\left \{ {{x+y=20} \atop {x=y+1}} \right.{x=y+1x+y=20

isolar o x:

(y+1)+y=20(y+1)+y=20

1+2y=201+2y=20

2y=192y=19

y = 9.5y=9.5

com y=9.5, calculamos o x:

x-9.5=1x−9.5=1

x=10.5x=10.59

x=10.58

y=95