Question

1) Resolva a inequação. ​

Answer 1

Resposta:

Primeiro passo é resolvermos o determinante de cada matriz.

DET(a) ≤ DET(b)

Resolvendo pelo Teorema de Laplace:

2.(2x+1)-1.(8-3)+3.(-4-3x) ≤ 1.(-6-4x)-3.(3-x)+1.(-4-2)

2.(2x+1)-1.(5)+3.(-4-3x) ≤ 1.(-6-4x)-3.(3-x)+1.(-6)

2.(2x+1)-5+3.(-4-3x) ≤ -6-4x-3.(3-x)-6

4x+2-5-12-9x ≤ -6-4x-9+3x-6

4x-15-9x ≤ -21-4x+3x

-15-5x ≤ -21-x

-4x ≤ -6

-4x ≤ -6

4x ≥ 6

x ≥ $\frac{6}{4}$ = $\frac{3}{2}$