Question

2) 3)
:((((((((((((((((((((((((((((((

Answer 1

2)$frac{7}{9y} =6.3$|:7

$frac{1}{9y} =0.9$

0.9*9y=1
8.1y=1|*10
81y=10
y=10/81

3)$frac{a}{b} - frac{8}{12} = frac{12a-8b}{12b} = frac{4(3a-2b)}{12b} = frac{3a-2b}{3b}$