Question

If xy^2 = 12 and xy = 4, what is x?

Answer 1

xy = 4 gives y = 4/x

Plug this in the first equation

Answer 2

\[x (\frac{ 4 }{ x })^2 =12\]

Answer 3

You must know what to do next

Answer 4

Lol I should you are right but it sure does not mean I do

Well, Can you say x 16/x^2 =12?

Answer 5

Keep going

Answer 6

\[x(\frac{ 16 }{ x^{2} })=12\]

and then you can multiply by x^2

\[x^{3} (16) =12?\]

Answer 7

Slow down your bus and relax

Answer 8

The air compressor isn't working...no air in the air brakes.

Answer 9

Well, If I am right so far, then 12/16

Answer 10

You cannot simply multiply a thing just one side. You must do the same thing to both sides.

Answer 11

Shoot

Answer 12

lol I feel like I'm at a math spa

Answer 13

You would be doing these problems quickly if you did them slowly and relaxedly

Answer 14

Sorry ya'll it is so slow

Answer 15

Ok so does the x^2 go on both sides?

Answer 16

\[x^{3}(16)=12* x^{2}\]

Answer 17

I guess he gone

Answer 18

Good. Keep going

Answer 19

Oh.

Answer 20

I don't understand why you had to multiply that on both sides. I mean, I was just simplifying the LHS

Answer 21

Oh wait, looks I've messed up. Let me pause my TV, one sec

Answer 22

We have

x * 16/x^2 = 12

Answer 23

Yes

Answer 24

Then you wanted to multiply both sides by x^2 is it ?

Answer 25

x3(16)=12∗x2

Answer 26

No dear

Answer 27

oh well I give up

Answer 28

On the left hand side,
notice that x^2 is in the bottom

Answer 29

That's the reason you wanted to multiply x^2 both sides. You want to kill the denominator by multiplying both sides by it.

Answer 30

I just posted that and you said no...

Answer 31

@mathstudent55 please help

Answer 32

\[x *\frac{ 16 }{ x^2 } =12\]why not simplify first...\[\frac{ 16 }{ x }= 12\]