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fomenos
3 years ago
13

Write an explicit formula for the sequence -13,-6,1,8

Mathematics
1 answer:
vladimir2022 [97]3 years ago
4 0

Answer:

\large\boxed{a_n=7n-20}

Step-by-step explanation:

It's an arithmetic sequence.

-6-(-13)=-6+13=7\\1-(-6)=1+6=7\\8-1=7

The difference is constant.

The explicit formula of an arihmetic sequence:

a_n=a_1+(n-1)d

Substitute:

a_1=-13,\ d=7

a_n=-13+(n-1)(7)                <em>use distributive property</em>

a_n=-13+7n-7\\\\a_n=7n+(-13-7)\\\\a_n=7n-20

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3x - 4y = 18<br>x + 3y = -7​
Mnenie [13.5K]

Answer:

x=2, y=-3

Step-by-step explanation:

x+3y+-7

move variable to the right and -3y from each side

x+3y-3y=-7-3y

x= -7-3y

3x -4y=18

3(-7-3y)-4y=18

solve for y, distribute

-21-9y-4y=18

collect like terms

-21-13y=18

move constant and change sign

-13y=18+21

add

-13y=39

divide by -13

y= -3

substitute

x=-7-3(-3)

solve

x=2

4 0
3 years ago
Graph: y = 3x - 5<br> Plz help
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Answer:

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hope this helped!

5 0
3 years ago
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Gemiola [76]
1.= 1
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3.= -18
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5. = -11
6. = 22
4 0
3 years ago
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Answer:

1st box ... can be the answe

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Answer:

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Step-by-step explanation:

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