:Dadas as retas r: 2x +y - 4 =0 e s: x -y - 2=0, indique o ponto em que elas se interceptam.
a) (2; 2) b) (2;1) c) (2; 0) d) (2;-1)
a) (2; 2) b) (2;1) c) (2; 0) d) (2;-1)
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Resposta:
C
Explicação passo a passo:
2x+y-4=0
2x+y=4
x-y-2=0
x-y=2
2x+y=4
x-y=2
______
3x+0=6
3x=6
x=6/3
x=2
x-y=2
2-y=2
-y=2-2
-y=0 (-1)
y=0
(2;0)