¡Hola!
RESOLVEMOS LAS SIGUIENTES DESIGUALDADES
1) x-12≤-19
x≤-19+12
x≤-7
[-∞;-7]
Rs→ a)
2) -4x≤-64
-4÷(-4)≥-64÷(-4)
x≥64÷(-4)
x≥64÷4
x≥16
[16,+∞]
Rs→ c)
3) 3x+8≥17
24≥17
0
4) 2(x-5)+3x≥2+x+8
2x-10+3x≥2+x+8
2x-10+3≥10+x
5x-10≥10+x
5x-10-x≥10
4+x-x≥10+10
4x≥20
x≥5
[5,+∞]
:)
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¡Hola!
RESOLVEMOS LAS SIGUIENTES DESIGUALDADES
1) x-12≤-19
x≤-19+12
x≤-7
[-∞;-7]
Rs→ a)
2) -4x≤-64
-4÷(-4)≥-64÷(-4)
x≥64÷(-4)
x≥64÷4
x≥16
[16,+∞]
Rs→ c)
3) 3x+8≥17
24≥17
0
Rs→ a)
4) 2(x-5)+3x≥2+x+8
2x-10+3x≥2+x+8
2x-10+3≥10+x
5x-10≥10+x
5x-10-x≥10
4+x-x≥10+10
4x≥20
x≥5
[5,+∞]
Rs→ c)
:)