Question

If y varies directly as x, find the direct variation equation for the situation.

y = 4 when x = 8

Answer 1

HI

Answer 2

hi

Answer 3

NEED HELP

Answer 4

yea

Answer 5

WHAT IS THE AEQUATION

Answer 6

TYPO

Answer 7

my topic is the equation is the equations

Answer 8

do you mean like y=kx?

Answer 9

y varies directly as x

that means you have an equation
y = k x
where k is some number
they want you to find k, and then write the correct equation

Answer 10

YES

Answer 11

to find k, replace the letters y and x with the numbers they gave you
put the numbers into
y= k x

can you do that ?

Answer 12

so 4=k8?

Answer 13

now "solve for k"
you divide both sides by 8
can you do that ?

Answer 14

y+=+%28kx%29 k being the constant of proportionality.

y = 27 when x = 21

27 = k*21

27/21 = k

Answer 15

**so 4=k8?***

\[ \frac{4}{8}= \frac{k\cdot 8}{8}\]
on the right side 8/8 is 1
and 1*k is k

what do you get on the left side?

Answer 16

0.5

Answer 17

or 1/2?

Answer 18

YEP

Answer 19

so now you can write down the "direct equation of variation"

1/2 or 0.5 mean the same thing.

so the answer (i.e. the equation they want) is
y = (1/2) x
or
y= 0.5 x

Answer 20

ok thxs

Answer 21

big help

Answer 22

MEDAL