Verified answer

1) y=3, y=2, y=-2, y=0, y=3, y=4, y=-1

2) x=-2; x=2, x=1.75, x=-0.5, x=-4.25; x=0, x=1.5, x=-5

3) x=2, -1, -3.5; y=3

4) хє [-5, 3]; ує [-2, 4]