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wariber [46]
4 years ago
15

Solve the system of equations.​

Mathematics
1 answer:
Alchen [17]4 years ago
5 0

Answer:

x = 10, y = 5

Step-by-step explanation:

Substitute the second equation into the x value of the first equation.

-4x + 11y = 15

-4(2y) + 11y = 15

-8y + 11y = 15

3y = 15

y = 5

Now substitute the y value into an original equation.

x = 2y

x = 2(5)

x = 10

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the lines below are perpendicular. if the slope of the green line is -1, what is the slope of the red line?
RideAnS [48]
The slope of the red line would be the inverse of the green line. so the red line's slope is 1.
Green line: -1/1
Red line:1/1
8 0
4 years ago
4.3 Mr Mokwebo 's two sons, Refentse and Tokelo have just passed grade 7 and grade 9 respectively. He will give them some money
Bumek [7]

The amount of money each of Mr Mokwebo 's two sons; Tokelo and Refentse will get is R116 and R95 respectively.

<h3>How to write and solve equation:</h3>

  • Amount needed to buy chocolate = R253
  • Tokelo's money = x
  • Refentse's money = x - 21

Total amount needed = Tokelo's money + Refentse's money

253 = x + (x - 21)

253 = x + x - 21

253 = 2x - 21

253 - 21 = 2x

232 = 2x

divide both sides by 2

x = 232/2

x = 116

Therefore,

Tokelo's money = x = R116

Refentse's money = x - 21

= 116 - 21

= R95

Learn more about equation:

brainly.com/question/2972832

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6 0
2 years ago
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Inga [223]

Answer:

Step-by-step explanation:

I don’t know

4 0
4 years ago
Read 2 more answers
The app store is offering 15 percent off any purchase for one day, only you decide to buy a game app that cost 12 dollars and 90
siniylev [52]

Answer:

$1.935

Step-by-step explanation:

As the store is offering a 15% discount, you have to calculate the 15% of the price of the game app to find the amount of the discount:

Price of the game app= 12.90

12.90*15%=1.935

According to this, the answer is that the amount of the discount if you buy the game app during the sale is $1.935 and you would have to pay: 12.90-1.935= $10.965.

5 0
3 years ago
Explicit formula for geometric
Harlamova29_29 [7]
Remark
What you have to do to learn the difference between recursive and explicit is try try the first 3 or 4 terms to see what you have and how you did it.

a1 = - 3
a2 = - 3 (1/8) = -3 / 8

a3 =  (a2) (1/8)
a3 =  (-3/8) * 1/8
a3 =  (- 3/64)

a4 =  a3 (1/8)
a4 = -3/64 * 1/8
a4 = - 3 / 512  

Take a good look at a4. What do you notice? No matter what, you are always multiplying by 1/8. That means that A and D are both wrong which they would have you raising by 3 or - 3 to some power.

So which one of B and C is correct?
The answer is which ever one will not change sign from what it started out with. All four terms are minus. 

In B the term is multiplied by plus 1/8. That will not change the sign of the next term.

So the answer is
a_n = - 3 * (1/8)^(n - 1) <<<<< answer
6 0
4 years ago
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