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b) x<-7 => x ∈R [-6;+∞>
c) x<_ -9 => x ∈ R [-9; +∞>
d) x<_ -3 => x ∈R [-3; +∞>
^ ^/
x∈(-∞,3 )
b)
simplificas la mitad
x∈(-∞ , -7)
c)
-x ≤ 9
x≥-9
x∈[ -9 , ∞)
d)
-2x≥6
el s q esta multiplicando pasa al otro lado a dividir
simplificamos la mitad
x≤3
x∈(-∞ , - 3)