12-4y=y-3
(subtract 12 from both sides)
-4y=y-15
(subtract y from both sides)
-5y=-15
(multiply both sides by -1 to make them positive)
5y=15
(divide by 5)
y=3
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y times y times y (or y3)
Differentiating with respect to one variable means thinking of all the other variables as constants. The answer is thus y=0.
They don't seem to different at first. But the thing is, Y3 is outdated and old. It may still have the original database of Y8, but Y3 is older. If you notice the layout of the new Y8, it is newer and more user friendly. Plus a really world-known game, Bloons Tower Defense, can't be found on Y3 easily, while Y8 brings the searches instantly. Y8 is better than Y3.
y5 * y3 * y = y5 * y3 * y1 = y5+3+1 = y9
6x+y=3