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Vika [28.1K]
3 years ago
6

Solving systems of equations by substitution y=9×-9 y=9

Mathematics
2 answers:
lara31 [8.8K]3 years ago
5 0
Y = 9x - 9
y = 9

   9 = 9x - 9
<u>+ 9        + 9</u>
<u>18</u> = <u>9x</u>
 9      9
  2 = x
y = 9x - 9
y = 9(2) - 9
y = 18 - 9
y = 9
(x, y) = (2, 9)
irakobra [83]3 years ago
5 0
Okay, you substitute the y in y=9x-9. It gives us, 9=9x-9. you add nine to both sides to eliminate the -9 on the right side of the equation. So far we have, 18=9x. Divide both sides by 9. We get 2=x. And thats your answer.
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Let us find revenue function by multiplying price of p units by demand function as:

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Since revenue function is a downward opening parabola, so its maximum point will be vertex.

Let us find x-coordinate of vertex using formula \frac{-b}{2a}.

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Let us substitute x=68 in revenue formula.

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