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=3(x-3)<4(x+6)
=3x-9<4x+24
=-x<33
=x>-33
HP={x>-33}
No2
y=4x-11
2x+y=1
**substitusi**
2x+y=1
2x+4x-11=1
6x=12
x=2
No3
xkuadrat + x > 90
x^2 + x - 90 > 0
(x+10)(x-9) > 0
x=-10 v x=9
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-10 9
HP={x| x<-10, x>9}