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juin [17]
2 years ago
12

3x+1y=6 2x-1y=-1 plz helpllllllllll

Mathematics
1 answer:
Gwar [14]2 years ago
4 0

Answer:

x=1 y=3

Step-by-step explanation:

3x+y=6 is the same as y=6-3x

2x-y=-1 is the same as y=2x+1

set them equal to each other

6-3x=2x+1

5x=5

x=1

substitute the value of x into either equation

y=2(1) +1

y=3

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Tickets for a school jazz concert were sold before the concert and at the door. After reviewing ticket sales, the band director
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Answer: The answer is:

d=220, b=300

Step-by-step explanation:

You could solve this problem using a series of equations:

d+b=520

b-80=d

How I solve this is:

If d+b=520, you could divide 520 by 2 and say that d and b's average is 260 (though that is not their value).

Then , you know that the difference between them is 80. Since the average is 260, you could add half of 80 (which is 40) and subtract the same to get 220 and 300, which, as you can see, have a difference of 80 and add up to 520. Now you have to find out which is which.

Since 80 fewer tickets were purchased at the door than before the concert (d+80=b (the second equation)), you know that the number of tickets at the door is the lesser number, making the answer:

d=220, b=300


3 0
3 years ago
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What is 60 percent written as decimal
Sladkaya [172]
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60%
60 ÷ 100 = 0.60
60% written as a decimal is 0.60.

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0.60 × 100 = 60 
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So, 60% written as a decimal is 0.60 (0.6).

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3 years ago
Help me pwees no links<br><br> what is 159 rounded to the nearest tenth minus 10
r-ruslan [8.4K]

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8 0
2 years ago
I need help with number 3
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What is the gcf of 3/7 and 4/9?
LiRa [457]

Answer:

  1/63

Step-by-step explanation:

There are a couple of ways to do this.

<h3>1) </h3>

Look for the GCF of the numerators when a common denominator is used.

  GCF(3/7, 4/9) = GCF(27/63, 28/63) = (1/63)·GCF(27, 28)

  GCF(3/7, 4/9) = 1/63

__

<h3>2) </h3>

Use Euclid's algorithm. If the remainder from division of the larger by the smaller is zero, then the smaller is the GCF; otherwise, the remainder replaces the larger, and the algorithm repeats.

  (4/9)/(3/7) = 1 remainder 1/63*

  (3/7)/(1/63) = 27 remainder 0

The GCF is 1/63.

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* The quotient is 28/27 = 1 +1/27 = 1 +(1/27)(3/7)/(3/7) = 1 +(1/63)/(3/7) or 1 with a remainder of 1/63.

_____

<em>Additional comment</em>

3/7 = (1/63) × 27

4/9 = (1/63) × 28

3 0
2 years ago
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