Respuesta :

Multiplying both sides by 8, we see that 6r=1.  Dividing by 6, r=1/6.
TSO
[tex] \frac{3r}{4} =\frac{1}{8}[/tex]

Cross multiply.
Note: [tex]\sf\frac{a}{b} = \frac{c}{d} \to ad=bc[/tex]

Cross multiplying we get:

[tex]3r(8) = 4(1) \\ 24r = 4\\r = \frac{4}{24} \\\\r=\frac{1}{6}[/tex]

I hope that helps :)