Question

-9≤3-4x<-2 Пожалуйста, помогите!

Answer 1

-9≤3-4x<-2

-9-3≤-4x<-2-3

-12≤-4x<-5

5/4<x≤3

1.25<x≤3

Answer 2

$-9\leq 3-4x<-2\; \; \; \Rightarrow \quad \left \{ {{3-4x\geq -9} \atop {3-4x<-2}} \right.\; \; \left \{ {{3+9\geq 4x} \atop {3+2<4x}} \right.\; \; \left \{ {{12\geq 4x} \atop {5<4x}} \right.\; \; \left \{ {{x\leq 3} \atop {x>1,25}} \right.\\\\1,25<x\leq 3\\\\x\in (1,25\; ;\; 3\, ]$