Question

Resolva usando a regra de Cramer {(3x+2y=8 e x+5y=7) *
a) (1,2)
b) (2,-1)
c) (1, -2)
d) (-1,2)
e) (2,1)

Answer 1

Resposta:

Alternativa e)

Explicação passo a passo:

$\Delta=\left[\begin{array}{ccc}3&2\\1&5\end{array}\right] =3.5-2=15-2=13$

$\Delta x=\left[\begin{array}{ccc}8&2\\7&5\end{array}\right] =8.5-7.2=40-14=26$

$\Delta y=\left[\begin{array}{ccc}3&8\\1&7\end{array}\right] =3.7-1.8=21-8=13$

x=Δx/Δ=26/13=2

y=Δy/Δ=13/13=1

(2,1)

Answer 2

Resposta:

dcp mas eu tou precisando d ponto taa