Question

determine o valor de a e b de modo que os vetores u

Answer 1

Paralelos $\frac{a}{d} = \frac{b}{e} = \frac{c}{f}$
$\frac{4}{6} = \frac{1}{a} = \frac{-3}{b}$
$\frac{4}{6} = \frac{1}{a}$
4a = 6
a=6/4 = 3/2

$\frac{1}{a} = \frac{-3}{b}$
b = -3a
$b = -3*\frac{3}{2} = \frac{-9}{2}$