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4 years ago

9x - y = 2318x + 4y = 16

Mathematics

2 answers:

Katarina [22]4 years ago

6 0

Answer:

X=2, Y=-5

Step-by-step explanation:

In the attached file

Artyom0805 [142]4 years ago

3 0

Answer:

(2,5)

Step-by-step explanation:

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Fudgin [204]

The correct answer is:

A) 300-70h = 30

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The variable h represents the number of hours.

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3 years ago

17.5% of 360 help please!!

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4 years ago

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Name the set(s) of numbers to which 1.18 belongs.

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3 years ago

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What is the average rate of change of f over the interval -1 on a separate sheet of paper and upload the work as a photo. Show a

Anarel [89]

Answer:

Average rate of change for the function $f(x)= x^2-x-1$ over the interval -1<x<1 is -1

Step-by-step explanation:

We need to find average rate of change of f over the interval -1 < x < 1

The function given is: $f(x)= x^2-x-1$

The formula used to find average rate of change is:

$Average\:rate\:of\:change=\frac{f(b)-f(a)}{b-a}$

We have, a = -1 and b = 1

Finding f(b) when b=1

$f(x)=x^2-x-1\\f(1)=(1)^2-(1)-1\\f(1)=1-1-1\\f(1)=-1$

Now, finding f(a), when a= -1

$f(x)=x^2-x-1\\f(-1)=(-1)^2-(-1)-1\\f(1)=1+1-1\\f(-1)=2-1\\f(-1)=1$

Now, putting values and finding average rate of change

$Average\:rate\:of\:change=\frac{f(b)-f(a)}{b-a}\\Average\:rate\:of\:change=\frac{f(1)-f(-1)}{1-(-1)}\\Average\:rate\:of\:change=\frac{-1-(1)}{1-(-1)}\\Average\:rate\:of\:change=\frac{-1-1}{1+1}\\Average\:rate\:of\:change=\frac{-2}{2}\\Average\:rate\:of\:change=-1$

So, average rate of change for the function $f(x)= x^2-x-1$ over the interval -1<x<1 is -1

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3 years ago

9x - y = 2318x + 4y = 16​

9x - y = 2318x + 4y = 16