Question

suppose y varies directly as x. write a direct equation that relates x and y. then solve. if y=45 whenx=15, find x when y=45

Answer 1

y = k * x

45 = k * 15 , what is k

Answer 2

k =

Answer 3

Is the answer 3

Answer 4

k=3

Answer 5

find x when y=45

Answer 6

y = k*x we know: k=3, y=45

45 = 3*x

the answer to this problem is what is the value of x

Answer 7

The answer is y=3x correct

Answer 8

yes

Answer 9

Thanks can u help me on another 1

Answer 10

second part of question:
"find x when y=45"

we can use our equation:
y=3x and set y to 45

Answer 11

Im confused

Answer 12

Thanks can u help me on another 1

Answer 13

sorry......

you did not solve the second part of the question

Answer 14

do you know the answer to the second part ?

Answer 15

No

Answer 16

y=3x

if y is 45, we have

45 = 3x

Answer 17

so x must be 15........

that's answer to second question :)

Answer 18

"write a direct equation that relates x and y."
y=3x

"find x when y=45"
x=15

Answer 19

If y=-4 when x=2, find y when x=-6

Answer 20

we must again make the equation

y = k*x

Answer 21

first, we have x and y -- find k

-4 = k * 2

Answer 22

Is that part -2

Answer 23

k=-2 :)

Answer 24

so our equation is:
y = (-2) * x

we can use the equation to solve second part

find y when x=-6

Answer 25

Is it 3

Answer 26

looks like it because of the way it is written

y=(-2) * (-6) <--- find y

Answer 27

they had given us x, not y this time

Answer 28

So is it 12

Answer 29

yep :) answer is 12

Answer 30

y is 12, when x=-6

our equation:
y = -2 * x

Answer 31

Okay thanks

Answer 32

no problem

Answer 33

If y =-9 when x=3, find y when x=-5

Answer 34

Would it be y=(-3)×x would it be 15

Answer 35

yes

and yes

completely right

Answer 36

If y=4 when x=16,find y when x=6

Answer 37

well y is 1/4 of x, so k=1/4
if that is the constant, then y = 1/4 * 6
which is 6/4 or 1 2/4 or 1 1/2

Answer 38

Okay would it be y=(.25)×x woukd it be 1.5

Answer 39

yes, exactly

Answer 40

If y=12 when x=18,find x when y=-16

Answer 41

now it starts to get difficult

y = k*x
12 = k*18

Answer 42

to get k alone, we must divide both sides by 18:
12/18 = k

Answer 43

.66

Answer 44

yeah, k=0.66

Answer 45

"find x if y=-16":

-16 = 0.66 * x

Answer 46

Would that be -24.24

Answer 47

both sides multiplied by 100:
-1600 = 66 x divide both sides by 66

-1600/66 = x
x = -1600/66 = -24.24, yes

Answer 48

Okay thanks :D ur amazing

Answer 49

thanks :P

Answer 50

I wish u could send pictures of the problem cause I dont know how to do it and it is a graph