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iren [92.7K]
3 years ago
15

Find the percent increase or decrease to the nearest percent. From 14 books to 40 books From 72 points to 50 points

Mathematics
1 answer:
Semmy [17]3 years ago
3 0

Answer:

44% increase

Step-by-step explanation:

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Solve system using linear combination. 5x + 3y = 41 and 3x - 6y = 9 show all work.
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Answer:

(7,2)

Step-by-step explanation:

5x + 3y = 41

3x - 6y = 9

Multiply the first equation by 2

2(5x + 3y) = 41 *2

10x +6y = 82

Add this to the second equation

10x +6y = 82

3x - 6y = 9

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13x = 91

Divide by 13

13x/13 = 91/13

x=7

Now we can find y

5x+3y = 41

5(7) +3y =51

35+3y=41

Subtract 35 from each side

35-35+3y=41-35

3y = 6

Divide by 3

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y=2

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3 years ago
The sum of two numers is 52 . The difference of the two numbers is 38 . What are the two numbers? Write the two numbers separate
Ray Of Light [21]
Let the first number be 'x' and the second number is 'y'

Equation 1: x + y = 52
Equation 2: x - y = 38

Rearranging equation 2 to make either x or y the subject
x = 38 + y

Substituting x = 38 + y into equation 1

x + y = 52
(38+y) + y = 52
38 + 2y = 52
2y = 52 - 38
2y = 14
y = 7

Substitute y = 7 into either equation 1 or equation 2 to find x

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x + 7 = 52
x = 52 - 7
x = 45

x = 45
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