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VMariaS [17]
2 years ago
14

Help within 10 min pleeeeeeeeeease

Mathematics
2 answers:
sineoko [7]2 years ago
4 0
The answer should be 75
kkurt [141]2 years ago
3 0

Answer:

10

Step-by-step explanation:

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Look at this system of equations.<br> 4x+3y=33<br> 2x+3y=21<br> What is the value of x+y?
Maurinko [17]

Answer:

x = 6

y = 3

x + y = 9

Step-by-step explanation:

(Step 1)

Isolate one of the variables in one of the equations. This will allow you to solve by substitution in the following steps.

2x + 3y = 21                             <----- Original equation

3y = -2x + 21                            <----- Subtract 2x from both sides

y = (-2/3)x + 7                          <----- Divide all terms by 3

(Step 2)

Substitute the new equation into the untouched equation and isolate the "x" variable.

4x + 3y = 33                                 <----- Original equation

4x + 3((-2/3)x + 7) = 33                <------ Substitute manipulated equation

4x - 2x + 21 = 33                          <------ Multiply 3 by terms in parentheses

2x + 21 = 33                                 <------ Subtract terms with variables

2x = 12                                         <----- Subtract 21 from both sides

x = 6                                             <----- Divide both sides by 2

(Step 3)

Plug the value of "x" into one of the equations to find the value of "y".

4x + 3y = 33                               <----- Original equation

4(6) + 3y = 33                             <----- Plug 6 in for "x"

24 + 3y = 33                               <----- Multiply

3y = 9                                         <----- Subtract 24 from both sides

y = 3                                           <----- Divide both sides by 3

(Step 4)

Since you now know the value of both variables, you can add them together to find your final answer.

x = 6

y = 3

x + y = ?

6 + 3 = ?

9 = ?

3 0
2 years ago
An ancient Chinese candle clock tells the amount of time that has passed by the amount of wax that has been melted off the candl
maxonik [38]

Answer:

Time = 560\ mins

Step-by-step explanation:

Given

Candles = 2 --- candles melted

Divisions = 12

Time = 4\ hrs --- time to melt

Required

The time since the first was lit

If 1 candle melts in 4 hours, 2 candles will melt in 8 hours.

i.e.

x = Candles * Time

x = 2 * 4hrs

x = 8hrs

For the 3rd candle that has melted, 4 inches

First, calculate the fraction that melt

Fraction = \frac{Melt}{Division}

Fraction = \frac{4}{12}

Fraction = \frac{1}{3}

The time to melt is:

y = Fraction * Time

y= 4 * \frac{1}{3}

y= \frac{4}{3}hrs

So, the required time is:

Time = x + y

Time = 8hrs + \frac{4}{3}hrs

Convert to minutes

Time = 8*60mins + \frac{4}{3}*60mins

Time = 480mins + 80mins

Time = 560\ mins

4 0
3 years ago
At the yearly fund raising drive, the nonprofit company 's goal was to raise $55,500 each day. After three days it had raised $5
maxonik [38]
This is honestly simple but we all need help! The answer is 55,053. Hope this helps! =3
5 0
3 years ago
Can a pair of strait angles also be adjacent angles? True or False
olchik [2.2K]
False  they will be parrallel and never meet
5 0
3 years ago
Read 2 more answers
Kane is training for a marathon. He starts by running 3 miles during every training session.
Masja [62]

Answer:

1/4w + 3 the answer has to be 20 characters long so ignore this

5 0
3 years ago
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