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166,168,170 и 172​

№166

1)x=-3 => y=9

x=4.5 => y=-6

x=0 => y=3

2)y=7 => x=-2

y=-3 => x=3

y=0 => x=1.5

№168

1)x=4 => y=3

x=-1 => y=-7

x=0.5 => y=-4

2)y=1 => x=3

y=-1 => x=2

y=0 => x=2.5

3)y>0 при xэ(2.5;+∞)

№170

1)x=8 => y=2

x=2 => y=0.5

x=-4 => y=-1

x=-3 => y=-0.75

2)y=-2 => x=-8

y= => x= -1

y=0 => x= 0

y=16 => x= 64

№172

1)x=4 => y=6

x=-2 => y=-3

2)y=-3 => x=-2

y=4.5 => x=3