Anyone here a math genius?

[Captain Morgan]

A friend on facebook posted this problem from her son's 6th grade math. I'm clearly an idiot, cause I can't figure it out.

If y*=3y-1, then what is 3*+5?

Seems to me that you have to solve for the y and also for the exponent, but I can't figure out how.

[Amber Lamps]

A friend on facebook posted this problem from her son's 6th grade math. I'm clearly an idiot, cause I can't figure it out.

If y*=3y-1, then what is 3*+5?

Seems to me that you have to solve for the y and also for the exponent, but I can't figure out how.

What does the "*" represent? Never mind I get it... you think you're dumb! Hahahaha

[EpyonXero]

Is y* supposed to be y^x where x is a variable?

[Trip]

Is y* supposed to be y^x where x is a variable?

yeah what was said above, the way you got it typed doesn't make sense and it's like his teacher made shit up. * is generally thought of as multiplication.

[Amber Lamps]

yeah what was said above, the way you got it typed doesn't make sense and it's like his teacher made shit up. * is generally thought of as multiplication.

Yep....:lol: At first glance I was like WTF! I ASSume that * means "x" as in y to the x power.

[Captain Morgan]

yeah what was said above, the way you got it typed doesn't make sense and it's like his teacher made shit up. * is generally thought of as multiplication.

Yep....:lol: At first glance I was like WTF! I ASSume that * means "x" as in y to the x power.

That's what I initially thought as well. but yeah, I also think it should be written as:

If y^x = 3y-1, then what is (3^x) + 5?

[EpyonXero]

I dont think that was copied right, if solve for x you get a complex number.

[Amber Lamps]

That's what I initially thought as well. but yeah, I also think it should be written as:

If y^x = 3y-1, then what is (3^x) + 5?

I keep coming up with 12.5...:lol:

y=2
x=2.5

[Trip]

I dont think that was copied right, if solve for x you get a complex number.

yep, there is some math in there that is not 6th grade level, i think there is some missing info that the teacher gave. I don't remember logarithms that early.

[EpyonXero]

I put it in Wolfram Alpha to see if I was missing something.

[Trip]

This is what I got

y^x=3y-1

x= (ln(3y-1)/ln(y)) only if y > 1/3

z=3^x+5

z = (3y-1)^(ln(3)/ln(y))+5

So basically we have two equations and 3 unknowns.

[Amber Lamps]

yep, there is some math in there that is not 6th grade level, i think there is some missing info that the teacher gave. I don't remember logarithms that early.

What's wrong with my answer?:lol:

[Trip]

What's wrong with my answer?:lol:

because without more info there is infinite solutions.

[EpyonXero]

Well the fact that we start with two variables, and only one complete equation means that you cant solve for both variables.

[Amber Lamps]

because without more info there is infinite solutions.

Aw shucks...

I really want this to be

yx=3y-1 solve for 3x+5

y=1
x=2

solution=11
:lol:

[DLIT]

Every now and again I like to look in these threads to make myself feel dumb. Success.

[Amber Lamps]

Well the fact that we start with two variables, and only one complete equation means that you cant solve for both variables.

Yea I know... I still think that this is some kind of misprint or something...:wink:

[Particle Man]

Every now and again I like to look in these threads to make myself feel dumb. Success.
Same here :lol

There's a reason I was an English major :lmao:

[racedoll]

Sounds like you need to get more info from her before any of us can solve it.

[Amber Lamps]

Sounds like you need to get more info from her before any of us can solve it.

Hey, I've solved it twice!:lol:

[anthonyk]

Y'all are making this way too complicated, I think.

3*=3(3)-1 = 8

8+5 = 13

[defector]

The answer is nipple. Duh.

[Trip]

Y'all are making this way too complicated, I think.

3*=3(3)-1 = 8

8+5 = 13

Where are you getting 3* = 3^2

[dReWpY]

the answer is 42

[Captain Morgan]

Where are you getting 3* = 3^2

He was substituting 3 for y, implying that if y* = 3y-1, then 3*+5 should equal (3x3 -1) +5

[Particle Man]

the answer is 42

The Ultimate Answer

[anthonyk]

He was substituting 3 for y, implying that if y* = 3y-1, then 3*+5 should equal (3x3 -1) +5

Yup.

[the chi]

I'm with Dlit.

Ugh.