Question 596274
(x,y)--> (x- 6, y- 4) means "take every x and subtract 6 from it to form the new x and take every y and subtract 4 from it to get the new y.



So A(2,1) translates to (-4, -3) because


New x: 2 - 6 = -4

New y: 1 - 4 = -3


Do the same with the other points to get 


B(3,3) translating to (-3,-1)


and 


C(4,0) translating to (-2,-4)

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With the scale factor of 3, this means that each coordinate is multiplied by 3.


So 

A(2,1) dilates to (6,3)
B(3,3) dilates to (9,9)
C(4,0) dilates to (12,0)