Question

Which is the direct linear variation equation for the relationship?

y varies directly with x and y = 12 when x = 4.


A.
y = 3x

B.
y = x + 8

C.
y = x – 8

D.
y = 2x + 4

Answer 1

@TheSmartOne

Answer 2

Direct variation is even stronger then proportional... i.e. y moves one for ever one x moves

Answer 3

so A

Answer 4

So that eliminates two choices. Which two?

Answer 5

nope, For a if x goes from 5 to 6, y goes from 15 to 18, 3 units.

Answer 6

For the equation form \[y=mx+b\] then m = 1 if direct var.

Answer 7

so A

Answer 8

Nope, not A or D.

Answer 9

so C

Answer 10

\[4-8 \ne 12\]

Answer 11

C

Answer 12

If it's C then \[12 \overset{?}{=} 4-8\]

Answer 13

@logan13 do you know what mean ,,direct variation" ?

Answer 14

yes?
no?
maybe?
not the foggiest?

have you covered linear variations yet?

Answer 15

right so C

Answer 16

You're just throwing random guesses in hopes that we tell you that's it is correct.

That's not how this works.

We need to make sure you understand the concept, so when people are trying to help you, please cooperate with them.

Answer 17

no i thought it was C

Answer 18

thank you @TheSmartOne

Answer 19

If you believe it is C, then you must also have some work to show that it is C.