Question

6х-8у при х=2/3 у=5/8

Answer 1

$6x-8y$ При $x=\frac{2}{3} \\ y=\frac{5}{8}$

$6*\frac{2}{3}-8*\frac{5}{8} =4-5=-1$

Answer 2

$\frac{6}{1} \times \frac{2}{3} - \frac{8}{1} \times \frac{5}{8} = - 1$