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3 years ago

Slove the following system of equations 7x+2y=-25 -5x-4y=5

Mathematics

1 answer:

Bingel [31]3 years ago

6 0

Answer:

x=-5

y=5

Step-by-step explanation:

Explanation is in picture (Where the lines cross is your answer)

Tip: Try using desmo calculator. Where the lines cross is your answer so all you need to do is type in your equations

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Including 6% sales tax, an inn charges $135.68 per night. Find the inns nightly cost

Andru [333]

135.68(1+0.06)^1= 144

4 0

3 years ago

Read 2 more answers

What is the slope of a line perpendicular to the line whose equation is x - y = 6. Fully simplify your answer.

Marat540 [252]

Answer:

-1

Step-by-step explanation:

first put the equation in slop int form:

y= x-6

to find the slope of a line that is perpendicular take the negative reciprical of the slope

so the answer is

-x

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2 years ago

4. The reflecting dish of a parabolic microphone has a cross-section in the shape of a parabola. The microphone itself is placed

elixir [45]

Assume the parabola is placed on a graph where the x-axis is the top of the dish.
The vertex is then at (0,-30) The x-intercepts or zeros are at (-30,0) and (30,0)

The equation of such parabola would be:
$y = a(x+30)(x-30)$
Plug in vertex to find value of 'a'
$-30 = a(0+30)(0-30) \\ \\ a = \frac{-30}{(-30)(30)} = \frac{1}{30}$

Now find the focus given that $p = \frac{1}{4a}$
$p = \frac{1}{4(1/30)} = \frac{30}{4} = 7.5$

Answer: the microphone should be placed 7.5 inches from vertex.

8 0

3 years ago

Help out omggggg !!!!!!

Alex17521 [72]

Answer:

sorry the diagram is not clear......

3 0

2 years ago

Which does not show a direct variation between x and y

kramer

<span><span>A. </span>y= 4 / x</span>

Proportionality or variation is state of relationship or correlation between two variables It has two types: direct variation or proportion which states both variables are positively correlation. It is when both the variables increase or decrease together. On the contrary, indirect variation or proportion indicates negative relationship or correlation. Elaborately, the opposite of what happens to direct variation. One increases with the other variables, you got it, decreases. This correlations are important to consider because you can determine and identify how two variables relates with one another. Notice x = y (direct), y=1/x (indirect)

5 0

2 years ago