Question

Considerando o sistema abaixo,o valor de a+b é:
A/4-B/5=-3
3A/4+B=7

Answer 1

A/4-B/5=-3 (♤)

3A/4+B=7 (♡)

-3 (♤)+(♡)

8B/5=16

B=10

A/4-10/5=-3

A/4=-1

A=-4

A+B=10-4=6