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2 years ago

Find the solution of the system of equations. –7x – 3y = –20 3х + 6= -15

Mathematics

1 answer:

Nutka1998 [239]2 years ago

7 0

Answer:

(-7,23)

Step-by-step explanation:

You can use the app photo math

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What does x,y mean I have no idea

uysha [10]

On a graph, when a line is going up or down, that is y. When it is going horizontally, that is x. So they can be used as points. For example, if the coordinates were 3, 4, (x, y), then you would first go across 3 on the graph and then go up 4. There you would plot your point. It can also be used in equations. For example, if the equation was..
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2 years ago

6 times a number plus 4 is the same as the number minus 11. (what is the equation to this?)

Mice21 [21]

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2 years ago

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Please help me Will give brainliest for first answer 12x=12*14+24x Find the value of x

abruzzese [7]

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3 years ago

Read 2 more answers

Identify the graph that has a vertex of (1,-1) and a leading coefficient of a=2.

soldi70 [24.7K]

ANSWER

$f(x) = 2 ({x - 1)}^{2} - 1$

EXPLANATION

The vertex form of a parabola has equation:

$f(x) = a ({x - h)}^{2} + k$

where V(h,k) is the vertex of the parabola and 'a' is the leading coefficient.

From the question, we have that, the vertex is

$(1,-1)$

and the leading coefficient is

$a= 2$

We substitute the vertex and the leading coefficient into the vertex form to get:

$f(x) = 2 ({x - 1)}^{2} + - 1$

We simplify to get:

$f(x) = 2 ({x - 1)}^{2} - 1$

The graph of this function is shown in the attachment.

6 0

2 years ago

Please help me understand this

Elena-2011 [213]

We have the equations of 3 functions and we want to find which one of them will decay the fastest to 4 grams.

This can be done by setting each expression equal to 4 and find which of them gives the smallest value of t.

For Amount A:

$4 =8e^{-0.1386t} \\ \\ 
\frac{1}{2}=e^{-0.1386t} \\ \\ 
ln(\frac{1}{2})=ln(e^{-0.1386t}) \\ \\ 
-0.693=-0.1386t \\ \\ 
t=3.775$

Likewise for Amount B:

$4=10e^{-0.2t} \\ \\ 
 \frac{2}{5}= e^{-0.2t} \\ \\ 
ln(\frac{2}{5})=ln(e^{-0.2t}) \\ \\
-0.916=-0.2t \\ \\ 
t=4.58 
$

Similarly for Amount C:

$4=9e^{-0.3t} \\ \\ 
ln( \frac{4}{9})=ln(e^{-0.3t} ) \\ \\ 
-0.811=-0.3t \\ \\ 
t=2.073$

Thus Amount C will take the minimum time to decay to 4 grams.

6 0

3 years ago