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Veseljchak [2.6K]
3 years ago
12

In a class of 23 student the girls were 7 more than the boys how many boys were in the class​

Mathematics
1 answer:
Softa [21]3 years ago
5 0

Answer:

x=# of boys

x+7=# of girls

x+x+7=25

2x+7=25

2x=25-7

2x=18

x=18/2

x=9 boys

x+7=16 girls

 

If you don't understand variables use trial and error.

 

Boys     Girls

1           8

2           9

3           10

4           11

5           12

6           13

7           14

8           15

9           16   9+16=25 students

 

You could start this way...

 

Boys     Girls

12        13

11        14

10        15

9          16     16 is 7 more than 9

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USPshnik [31]
-30x + 16. You use the distributive property to get -24x + 28 -12 -6x. Then combine like terms to get -30x + 16.
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3 years ago
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2y = 4x - 8<br> y = x +4<br> Solve by substitution
Nataly [62]

Answer:

x=8

Step-by-step explanation:

2(x+4)=4x-8

2x+8=4x-8

2x+8-8=4x-8-8

2x=4x-16

2x-4x=4x-16-4x

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Divide by -2 on both sides

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3 years ago
-1
Luba_88 [7]

Answer:

y=20x

Step-by-step explanation:

do do I intercept a zero, so you don't have a "b"

The slope is 20. that's pretty self-explanatory

7 0
3 years ago
I need help to find the unknown angle measures.And the equation pls, the problem is down below.
Ivenika [448]

Answer:

Step-by-step explanation:

Corresponding angles equal 180 degrees when added

6x + 3x = 180

9x = 180

x = 20

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2 years ago
Help wanted ill do brainliest!!
Pani-rosa [81]

Answer:

x=-1

Step-by-step explanation:

0.5 ( 5 - 7x ) = 8 - ( 4x + 6 )

<u>- Distribute 0.5 by 5 and -7x</u>

2.5 - 3.5x = 8 - ( 4x + 6 )

Second- Distribute the invisible one into 4x and 6

2.5 - 3.5x = 8 - 4x - 6

- Combine like terms: Subtract 6 from 8

2.5-3.5x= - 4x + 2

-Add 4x from both sides of the equation

2.5 + 0.5x = 2

-Subtract 2.5 from both sides of the equation

0.5x = 2- 2.5

0.5x = -0.5

-Then divide each side by 0.5x

<u>0.5x</u>  = <u>-0.5</u>

0.5      0.5

-Cancel the common factor of 0.5

x = <u>- 0.5</u>

      0.5

-Divide -0.5 by 0.5

X = -1

6 0
3 years ago
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