3 years ago

Braceleftzf y = 8/7 x − 2/3 8/3 x + y = 5/9

Mathematics

1 answer:

givi [52]3 years ago

7 0

Answer:

(x, y) = (77/240, -3/10)

Step-by-step explanation:

It is convenient to write the equations in standard form.

Multiplying the first equation by 21 gives ...

21y = 24x -14

Multiplying the second equation by 8 gives ...

24x +9y = 5

Then the system of equations in standard form is ...

24x -21y = 14
24x +9y = 5

Subtracting the first from the second, we get ...

(24x +9y) -(24x -21y) = (5) -(14)

30y = -9

y = -9/30 = -3/10

Substituting this into the second equation, we have ...

24x +9(-3/10) = 5

24x = 7.7 . . . . . . . add 27/10

x = 7.7/24 = 77/240

The solution is (x, y) = (77/240, -3/10).

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The rectangle has an area of 42 sq. in. Which of these could be the dimensions of the rectangle?

photoshop1234 [79]

Answer:

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Step-by-step explanation:

8 0

3 years ago

The veloctiy of sound in air is given by the equation v=20 times the square root of 273+t where v is the velocity in meters per

Nikitich [7]

So we just need to plug in our values and solve
$v = 20 \sqrt{273 + t}$
we are given v is 369 so we have
$369 = 20 \sqrt{273 + x}$
now we solve for x.
divide both sides by 20
square both sides
subtract 273 from both sides
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5 0

3 years ago

Read 2 more answers

Order from greatest to least, 19/4, 45/10, 4 3/5.

pogonyaev

Answer:

45/10, 4 3/5, 19/4

Step-by-step explanation:

19/4 = 4.75

45/10 = 4.5

4 3/5 = 23/5 = 4.6

4.75 > 4.6 > 4.5