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____ [38]
3 years ago
11

For khan:) 2x + 5y > -6 - 4x + 3y = 2 Is (-1,7) a solution of the system?

Mathematics
1 answer:
KiRa [710]3 years ago
3 0

Step-by-step explanation:

let \: 2x + 5y >  - 6 ... i  \\  - 4x + 3y = 2 ...ii\\ let \: x =  - 1 \\ y = 7\\ from \: i \: equation \\ 2x + 5y >  - 6 \\ then \: keeping \: value \: of \: x \: and \: y \\ 2 \times  - 1 + 5 \times 7  >  - 6 \\  - 2 + 35 >  - 6 \\ 33 >  - 6 \\ from \: ii \: equation \\  - 4x + 3y = 2 \\  - 4 \times  - 1 + 3 \times 7 = 2 \\ 4 + 21 = 25

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How many different ways can you write a fraction that has a numerator of 2 as a sum of fractions
svetoff [14.1K]
Infinitely many ways! 
Suppose you have the fraction 2/d.

<span>Pick </span>any<span> pair of integers a and b where b ≠ 0.</span>
Then 2b-ad is and integer, as is bd so that (2b - ad)/bd is a fraction.

Consider the fractions a/b and (2b - ad)/bd

<span>Their sum is </span>
a/b + (2b-ad)/bd = ad/bd + (2b-ad)/bd = 2b/bd = 2/d - as required.

<span>Since a and b were chosen arbitrarily, there are infinitely many possible answers to the question.</span>
5 0
4 years ago
A commercial airplane is flying at an elevation of 15,000 feet and ascends to an elevation of 20000 feet at a rate of 1250 feet
Ksju [112]

Answer:

4 minutes

Step-by-step explanation:

Put it into an equation

20000 = 1250x + 15000

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5000 = 1250x

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6 0
3 years ago
I need help with both of these someone please help me . you’ll get 20 brainly points !!
Orlov [11]

Answer:

First question: 42cm^2

Second question:

whole figure: 150 cm^2

blue part: 96cm^2

white part:54cm^2

Step-by-step explanation:

Lets do math:

look you gave me alot to do but lets go:

Question 1:

lets find the area of the whole rectangle without the parts taken away.

6*10-60

lets put that away for a little bit and move onto the empty space that we have to take away from the rectangle to get this shape.

im now going to subtract 2 from 10 to get 8. I did this to find out the a length

8*3=24

18 is the area of the shape that we have to subtract from the big rectangle

lets now take out the area we put away for a little while.

60-18=42

so 42 is the area of the first shape.

Question #2:

This problem needs multiple answers so lets get started.

first we need to find the area of the big rectangle.

10*15=150

lets put that away for a little bit.

now lets find the area of the little rectangle

6*9=54

to find the blue we have to subtract 54 from 150 which is 96

so now we have this:

area of the whole figure:150

area of the shaded rectangle inside (white): 54

area of the shaded rectangle (blue): 96

phew that was a lot of typing

the end

8 0
4 years ago
(6 x2 - 6x + 4) - (x2 – 5x – 9)
DedPeter [7]
The answer is 9x+13
4 0
3 years ago
When humans urbanize an area, what other impact will they end up having as well?
oksano4ka [1.4K]

Answer: When humans urbanize an area they

Step-by-step explanation: I think this because before people urbanized the place it was probably like a rural place or suburban. When you urbanize a place you might be taking a person or an  animals homeland away and that can be a bad impact on them.

6 0
4 years ago
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