3 years ago

Evaluate the expression y=7 x=8 x+ 4y

Mathematics

2 answers:

Elena L [17]3 years ago

8 0

Answer:

Step-by-step explanation:

x+4y=8+4(7)=8+28=36

alexira [117]3 years ago

3 0

You just plug in the numbers: 8+4(7)=8+28=36. Hope this helped!

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Which quadratic function in vertex form can be represented by the graph that has a vertex at (3, -7) and passes through the poin

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$~~~~~~\textit{vertical parabola vertex form} \\\\ y=a(x- h)^2+ k\qquad \begin{cases} \stackrel{vertex}{(h,k)}\\\\ \stackrel{"a"~is~negative}{op ens~\cap}\qquad \stackrel{"a"~is~positive}{op ens~\cup} \end{cases} \\\\[-0.35em] ~\dotfill$

$\begin{cases} h=3\\ k=-7 \end{cases}\implies y=a(x-3)^2-7\qquad \textit{we also know that} \begin{cases} x=1\\ y=-10 \end{cases} \\\\\\ -10=a(1-3)^2-7\implies -3=a(-2)^2\implies -3=4a\implies -\cfrac{3}{4}=a \\\\[-0.35em] ~\dotfill\\\\ ~\hfill y=-\cfrac{3}{4}(x-3)^2-7~\hfill$