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yKpoI14uk [10]
3 years ago
15

19) You want to solve the system below by eliminating y. You multiply the first equation by 7. By what number should you multipl

y the second equation? * 2x - 5y = 1 -3x + 7y = -3 -5 5 -7 7
i do not know
​
Mathematics
1 answer:
spin [16.1K]3 years ago
6 0

Answer:

Should be 7 because you want the equations to balanced.

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Tatiana [17]

Answer:

x = -1 and y = 1/2

Step-by-step explanation:

Let u = 1/x, and v = 1/y

Then the pair of equations

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Can be written as

-3u + 4v = 11 .................................(1)

u - 2v = -5......................................(2)

From (2)

u = 2v - 5 .......................................(3)

Substituting (3) into (1)

-3(2v - 5) + 4v = 11

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-6v + 4v = 11 - 15

-2v = -4

v = 4/2 = 2

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u = 2v - 5

u = 2(2) - 5

= 4 - 5

= -1

That is

u = -1, v = 2

Since u = 1/x, and v = 1/y, we have

1/x = -1

=> x = -1

And

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=> y = 1/2

Therefore

x = -1 and y = 1/2

4 0
3 years ago
People said to put a picture of it so here
wariber [46]

Answer:

I think right answer is integers

3 0
3 years ago
In 1967, New Zealander Burt Munro set the world record for an Indian motorcycle, on the Bonneville Salt Flats in Utah, with a ma
bagirrra123 [75]

Answer:49 sec

Step-by-step explanation:

Given

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a=\frac{60\times 60\times 60}{4}

a=54\times 10^3 mi/h^2

To reach a speed of 183.58mi/h with an acceleration of 54\times 10^3 mi/h^2

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t=0.00339 hours

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7 0
3 years ago
What is ✓ 75 in simplified form?<br> O 5V5<br> 0 2573<br> O 3V 5<br> O 3V 25
faust18 [17]
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3 years ago
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DerKrebs [107]

Answer:

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5 0
3 years ago
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