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Mathematics 8 Online
OpenStudy (majesty69):

@Jamierox4ev3r

OpenStudy (majesty69):

For the graphed function f(x) = (4)x - 1 + 2, calculate the average rate of change from x = 2 to x = 4.

OpenStudy (majesty69):

OpenStudy (majesty69):

−68 −30 68 30

OpenStudy (majesty69):

Like is said I put 68......

OpenStudy (anonymous):

\[\frac{ y _{2}-y _{1} }{ x _{2}-x _{1} }\]

OpenStudy (majesty69):

@dan815 @Jamierox4ev3r

OpenStudy (majesty69):

But where does the 68 and 30 come from?

OpenStudy (anonymous):

are you sure the equation is f(x)=4x-1+2?

OpenStudy (majesty69):

\[(4)^{x-1}+2\]

OpenStudy (anonymous):

oh simply find what is y when x is 2 and 4 then use the slope formula to find the average change

OpenStudy (anonymous):

I wrote the slope formula above.

OpenStudy (majesty69):

Im so confused :(

OpenStudy (anonymous):

Since you are doing it from x=2 to x=4 first plug 2 in the equation. Whatever you get it's your y so you will have 1 point (x1,y1). Then plug 4 to the the other one and you will have (x2,y2). Then you use this 2 points to plug them in on the slope formula from above which asks y2-y1 / x2-x1.

OpenStudy (anonymous):

still confuse?

OpenStudy (majesty69):

(6,66) ?

OpenStudy (anonymous):

wait how did you get 6,66?

OpenStudy (majesty69):

as x,y

OpenStudy (anonymous):

the first point should start with (2,y) and the second as (4,y)

OpenStudy (majesty69):

2,6 and 4,66?

OpenStudy (anonymous):

yes!

OpenStudy (anonymous):

now plug them on the slope formula

OpenStudy (majesty69):

30?

OpenStudy (anonymous):

yep

OpenStudy (majesty69):

Thank YOU!

OpenStudy (anonymous):

no problem

OpenStudy (majesty69):

Can you check one more? lol

OpenStudy (majesty69):

@Mateaus i think i have an the right answer

OpenStudy (anonymous):

sure, trow it out :p

OpenStudy (anonymous):

let me know the equation and x's and your answer to see if I get the same.

OpenStudy (majesty69):

What is the solution of \[\log_{3x-5} 16\] = 2 I got x=-3

OpenStudy (anonymous):

Your answer is almost right but still incorrect

OpenStudy (majesty69):

3? lol

OpenStudy (anonymous):

yeah haha

OpenStudy (anonymous):

(3x-5)^2 = 16

OpenStudy (anonymous):

3x-5 = sqrt 16

OpenStudy (anonymous):

3x-5 = 4

OpenStudy (majesty69):

Okay

OpenStudy (anonymous):

3x = 9

OpenStudy (anonymous):

x = 3

OpenStudy (majesty69):

Thank You

OpenStudy (anonymous):

no problem

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