Answer:
a) x= -3 y=0
x= -2 y=8
x= -1 y=6
x= 0 y=0
x= 1 y= -4
x= 2 y= 0
x= 3 y= 18
b) x³ + x² - 6x=0
x* (x² + x -6)=0
x( x(x-2) +3(x-2))=0
x=0
x-2=0 x=2
x+3=0 x= -3
x= 0, x=2, x=-3
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