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Bumek [7]
3 years ago
5

13) -3x - 4y = 8-4x - 3y=6​

Mathematics
1 answer:
Dvinal [7]3 years ago
6 0

Answer:

x = 0, y = -2

Step-by-step explanation:

-3x - 4y = 8  (1)

-4x - 3y=6​ (2)

Multiply (1) by -4 and (2) by -3, we have:

12x + 16y = - 32  (3)

12x + 9y= -18​ (4)

Subtract (4) from (3), we have:

(12x + 16y) - (12x + 9y) = - 32  - (-18)

<=> 7y = - 14

=> y = - 2

Replace y with - 2 in (3), we have x = 0

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amid [387]
Sorry yo i just need points :/
5 0
3 years ago
Are the following ratios equivalent? Why or why not? 4:5 and 16:20
MrRissso [65]

Answer:

Equivalent

Step-by-step explanation:

4:5      multiply both sides by 4  to get    16:20    

4 0
2 years ago
a survey of 153 law firms in a coutry found that the aveage hourly billing roate for partners is 642 what is the population
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Answer:

Population, well, it is recorded as partners and 642x153=98226 is calculated correctly, you divided by 2 which is 98226 divided by 2 is 49113.

8 0
2 years ago
A bag contains 5 blue marbles, 2black marbles ,and 3 red marbles. A marine is randomly drawn from the bag The probability of not
notka56 [123]

Answer:

80%; 30%

Step-by-step explanation:

There is 5 blue marbles, 2 black marbles, and 3 red marbles. In other words, there is a total of 10 marbles.

There are only 2 black marbles and 8 marbles that are not black. Therefore, the probability of <em>not</em> drawing a black marble is 8/10 or 4/5 or 80%.

There are only 3 red marbles out of the 10 total marbles. Therefore, the probability of drawing a red marble is 3/10 or 30%.

6 0
3 years ago
A machine is designed to fill 16-ounce bottes of shampoo. When the machine is working properly, the amount poured into the bottl
vlada-n [284]

Answer:

(D) 15.90 to 16.20 ounces

Step-by-step explanation:

Confidence Interval = mean + or - (t×sd)/√n

Mean = 16.05 ounces, sd = 0.1 ounce, n = 4, degree of freedom = n - 1 = 4 - 1 = 3, t = 3.182

Lower limit = 16.05 - (3.182×0.1)/√4 = 16.05 - 0.15 = 15.90 ounces

Upper limit = 16.05 + (3.182×0.1)/√4 = 16.05 + 0.15 = 16.20 ounces

The sample mean will fall from 15.90 to 16.20 ounces

7 0
3 years ago
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