Question

4a+7b=30

a=7,5......... помогите сроно

Answer 1

4*7,5+7б=30
30+7б=30
7б=0
б=0

Answer 2

4a+7b=30
при a=7,5
4*7.5+7b=30
30+7b=30
7b=30-30
7b=0
b=0:7
b=0