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Solve the following system of equations.
y= 3x^2 + 2
y= 9x + y = -4

User Artorias
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1 Answer

2 votes

Explanation:

I believe there is a typo in the second equation. It should only be $y=9x-4$.

To solve the system of equations, we can substitute the first equation into the second equation for $y$. This gives us:

\begin{align*}

y &= 9x-4 \\

3x^2+2 &= 9x-4 \\

3x^2-9x+6 &= 0 \\

x^2-3x+2 &= 0 \\

(x-1)(x-2) &= 0

\end{align*}

So, $x=1$ or $x=2$.

To find the corresponding values of $y$, we can substitute these values of $x$ into the first equation:

\begin{align*}

\text{If } x=1: \quad y &= 3(1)^2+2 = 5\\

\text{If } x=2: \quad y &= 3(2)^2+2 = 14

\end{align*}

Therefore, the solutions to the system of equations are $(1,5)$ and $(2,14)$.

User Jens Hoffmann
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