Question

resolução de equaçao a/4-b/5=-3 e 3a/4 b=7

Answer 1

a/4-b/5=-3
12/4-30/5=-3
  3 - 6 = -3
     -3=-3
a=12 e b=30

3a/4b=7
3.28/4.3=7
84/12=7
  7=7
a=28 e b=3