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

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