COM CONTA PORA FAVOR : 1)A função y= -3x-12 é positiva para:
a)x > - 4
b)x >  4
c)x< - 4 
d)x < 4 

2)A função y= -4x+8 é negativa para:
a)x>2
b)x> - 2 
c)x< - 4
d)x< 4 
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