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3 years ago

I have problems Understanding systems Variable like this example

1 answer:

7 0

4x−2y+z=8
Step 1: Add 2y to both sides 4x−2y+z+2y=8+2y4x+z=2y+8
Step 2: Add -z to both sides 4x+z+−z=2y+8+−z4x=2y−z+8
Step 3: Divide both sides by 4 4x4=2y−z+84x
=1/2y+−1/4z+2

−y+z=4
Step 1: Add -z to both sides −y+z+−z=4+−z−y=−z+4
Step 2: Divide both sides by -1 −y−1=−z+4−1y

=z−4

2z=4
Step 1: Divide both sides by 2 2z/2=4/2
=z=2

You might be interested in

An office manager recorded the number of reams of paper that were used for a printer each month for six months: 15, 10, 25, 19,

Virty [35]

A)
10, 15, 17, 19, 25 
Min: 10 
Median: 17 
Max: 25 

lower Quartile: (10+15)/2 = 12.5 
upper Quartile: (19+25)/2 = 22 

b) 
http://imageshack.us/photo/my-images/22/...

c) 
Mean: (10 + 15 + 17 + 19 + 25)/5 = 17.2 

[ ( 17.2 - 10 )^2 + ( 17.2 - 15 )^2 + ( 17.2 - 17 )^2 + ( 17.2 - 19 )^2 + ( 17.2 - 25 )^2 ] / 5 = 24.16 

√( 24.16 ) ≈ 4.92 
-------------- 
4) 

[ 4. . .-2 . . . -12 ------> 3R1 - 4R2 ----> R2 
3. . .-1 . . . -3 ] 

[ 4. . .-2 . . . -12 ------> R1 - R2 ----> R1 
0. . .-2 . . . -24 ] 

[ 4. . ..0 . . . .12 ------> R1/4 ----> R1 
0. . .-2 . . . -24 ] R2/-2 ----> R2 

[ 1. . ..0 . . . .3 
0. . .1 . . . 12 ] 

x = 3 & y = 12

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

6 0

3 years ago

WILL GIVE 100 POINTS

padilas [110]

(a) The explicit rule to model the sequence formed by the number of seats in each row is $a_{n}=15+3n$

(b) The 35th row has 120 seats

Step-by-step explanation:

The rule of the nth term of an arithmetic sequence is

$a_{n}=a+(n-1)d$ , where

a is the the first term
d is the common difference between each two consecutive terms

∵ There are 18 seats in the 1st row

∵ There are 21 seats in the 2nd row

∵ 21 - 18 = 3

∵ The number of seats is increased by 3 with each additional row

- The number of seats in each row represents an arithmetic

sequence because there is a common difference between

each two consecutive rows

∴ The number of seats in each row formed an arithmetic sequence

∵ The number of seats in the first row = 18 seats

∴ a = 18

∵ The number of seats in a row continues to increase by 3 with each

additional row

∴ d = 3

- Substitute the values of a and d in the rule of nth term

∴ $a_{n}=18+(n-1)3$

- Simplify the right hand side

∴ $a_{n}=18+3n-3$

- Add like terms

∴ $a_{n}=15+3n$

(a) The explicit rule to model the sequence formed by the number of seats in each row is $a_{n}=15+3n$

∵ There are 120 seat in a row

- Substitute $a_{n}$ by 120 in the rule above

∴ 120 = 15 + 3n

- Subtract 15 from both sides

∴ 105 = 3n

- Divide both sides by 3

∴ n = 35

∴ The number of the row is 35

(b) The 35th row has 120 seats

Learn more:

You can learn more about the sequences in brainly.com/question/7221312

#LearnwithBrainly

6 0

3 years ago

4−(−8)= please help i need it now

s344n2d4d5 [400]

Answer:

hope it helps...

- multiplied with another - gives us a +.

While opening a bracket we consider a sign of multiplication. so the equation becomes 4 + 8 which gives us 12. Thus 12 is the answer.

pls give brainliest for the answer

4 0

3 years ago

Read 2 more answers

Find the variable x.

grandymaker [24]

Answer:

x = 7

Step-by-step explanation:

The inscribed angle (5x - 3) is equal to half the measure of the intercepted arc

5x - 3 = 0.5(9x + 1) ← multiply both sides by 2

10x - 6 = 9x + 1 ( subtract 9x from both sides )

x - 6 = 1 ( add 6 to both sides )

x = 7

5 0

3 years ago

At the end of a party, 3/4 cup of dip is left. Jim divides 4/7 of the leftover dip equally between 2 friends. How much dip does

Vesnalui [34]

Answer:

First, we need to find the amount of dip that was divided amount the two friends.

We know that it is 4/7 of the left dip

therefore:

amount divided among the two friends = (4/7) x (3/4) = 3/7 of the original amount of dip.

This amount is divided among two friends,

therefore:

amount that each friend gets = (3/7) / (2) = 3/14 = 0.2 of the amount of dip

tell me if this is completely wrong because i'm not good at this

7 0

3 years ago