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LekaFEV [45]
2 years ago
13

Can you solve this for me

Mathematics
1 answer:
jenyasd209 [6]2 years ago
4 0

The number in the blank box should be 44 because it said that "3 times x and 4 times y is 44".

You need to multiply the first equation by 3:

3x + 3y = 39.

Then, subtract the first equation from the second equation:

3x - 3x = 0

4y - 3y = y

44 - 39 = 5

Your new equation should look like this: y = 5

Now, substitute y = 5 into the first original equation:

x + 5 = 13

x = 8

Ans. (x, y) = (8, 5)

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Ina a class of 30 children,60% can swim. how many children cannot swim?
rewona [7]
60% of the total (30) can swim
60% of 30 = (60/100)*30 = 0.60*30 = 18
So 18 children can swim

This means 30-18 = 12 cannot swim

---------------------------------------------------------

An alternative is to do it this way: 

We know 60% can swim so that means 40% cannot swim. 
Notice how 100% - 60% = 40%
Or in other words, the 60% and 40% add to 100%. This is because we have two choices: either the person can swim or cannot swim

Since 40% cannot swim, this means
40% of 30 = (40/100)*30 = 0.40*30 = 12
and we get the same result as before

---------------------------------------------------------

Final Answer: 12
6 0
3 years ago
Find the unit rate of the following: <br> (miles per hour)<br> 22.75 miles in 3.5 hours =
-Dominant- [34]

Answer:

The unit rate is 6.5mph or 6.5 miles per hour.

Step-by-step explanation:

22.75/3.5 = 6.5

5 0
2 years ago
10(x-5)= -80 <br>what is the value of the x​
Fittoniya [83]

Answer:

x = -3

Step-by-step explanation:

10(x-5) = -80

10x - 50 = -80

10x -50 + 50 = -80 + 50

10x = -30

10x ÷ 10 = -30 ÷ 10

x = -3

3 0
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Artyom0805 [142]

Answer:

x= -3

y= -5

Step-by-step explanation:

10y - 3x = -41

+

-5y + 3x = 16

10y + (-5y) = 5y

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-41 + 16 = -25

5y + 0 = -25

y = -25/5

y= -5

10y -3× = -41

(10×-5) - 3x = -41

- 3x = - 41 + 50

- 3x = 9

x = -3

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2 years ago
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Answer:

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Step-by-step explanation:

Its SSS

3 0
2 years ago
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