3 years ago

Find the point of intersection of the pair of straight lines Y= -7x - 4 -y = 8x + 9

Mathematics

1 answer:

Aleonysh [2.5K]3 years ago

4 0

Answer:

(-5,31)

Step-by-step explanation:

See image.

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Answer:

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3 years ago

The mean of 15 numbers is 12. An extra number is included and the mean increases to 13. What the extra number?

Studentka2010 [4]

Answer: 28

Step-by-step explanation:

The mean of 15 numbers = 12

Then , the sum of the numbers = 12x15 = 180

Let the extra number included be $x$ , then

The new sum = $x + 180$

And the new total number will increase from 15 to 16

new mean = 13 , so we have :

$\frac{x+180}{16} = 13$

$x+ 180 = 16(13)$

$x + 180 = 208$

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therefore , the extra number is 28

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3 years ago