Question

Dadas as funções x=-3b+2 e y= -10²(b/5²), determine o valor de b sabendo que x+y=-12

Answer 1

y=-100b/25
y=-4b

logo se x+y=-12 temos 

x-4b=-12  logo temos x=-12+4b

se x=-3b+2

-12+4b=-3b+2
3b+4b=2+12
7b=14
b=14/7
b=2