Answer:
-x • (81x3y4 + 343x2y2 - 7938x - 3969y2)
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441
To find the inverse of a function, we make the independent variable the subject of the formula.
Thus, the inverse of the given function is evaluated as follows.

From the work show, it can be seen that Talib's work is correct.
Rational number, because the Square root of 400 is 20, since 20 x itself is 400. Hope this helps!
X-3y=9
-3y=-x+9
Divide by -3
Y=1/3x+3
Slope is 1/3x
Y intercept is 3
X intercept is 9