Question

PLEASE HELP ME IM SO SERIOUS PLEASEEE SOMEBODY For the data in the table, does y vary directly with x? If it does, write an equation for the direct variation. (Hint: you need to find the “k” value)
x
20
30
40
y
2
10
18
PLEASE HELP MEEEEEE

Answer 1

so these are our points:
(20, 2)
(30, 10)
(40, 18)
make sense so far?

Answer 2

YES @DemolisionWolf

Answer 3

so for every 10 units in x, does the y change the same or is it a multiple?

Answer 4

ITS MULTIPLE

Answer 5

are you learning about exponential functions in you class right now?

Answer 6

im not really sure my teacher just gave us the study guide.. non of these questions will be on the test but they will be similar so im trying to learn how to do it

Answer 7

alright, give me a sec to see if i'm doing this right..

Answer 8

okay ( :

Answer 9

so I've looked it over, and the points given are linear, meaing you can solve this using the y=mx+b approach

Answer 10

from 2 to 10, its +8
from 10 to 18, its +8
so for every 10 units in the x direction, y changes by 8
get it?

Answer 11

yes i get it a little bit so how do i find the equation

Answer 12

the equation will be in the form of
y = mx + b
we have x and y, so we need to find m and b,
lets find m first,
m is the slope, can you find the slope from one point to the next?

Answer 13

is this right because in the hint it says find k how am im suppose to find k then do y = mx+b that sounds confusing

Answer 14

in you class, what does k stand for? slope? y-intercept?

Answer 15

this was out of the blue its a study guide for the exam so i have no clue

Answer 16

i'm sorry,
I believe I understand what the question is asking:

Answer 17

its okay

Answer 18

"does y vary directly with x?"
answer: yes.
"write an equation for the direct variation"
answer: 10:8, because for every 10 units in the x direction, the y moves 8.
(im not familiar with what k means, i'm sorry)