Question

Analise os sinais destas funções:
A)Y=4x-10

B)Y=-9x+3

Answer 1

a) 4x - 10 = 0
4x = 10
x = 5/2

4x-10>0
4x>10
x>5/2

4x-10<0
4x<10
x<5/2

b) -9x+3=0
9x=3
x=1/3

-9x+3>0
-9x>-3
9x<3
x<1/3

-9x+3<0
-9x<-3
9x>3
x>1/3