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we need a variable for the amount invested at say 7%
you pick it

it doesn't matter what you pick, so pick any letter you like

idk that's the problem i don't understand the question

i will walk you through it

pick some letter to represent the amount invested at 7% interest

you can pick such your smart and you know what your doing

there are 26 letters in the alphabet, you do not need to be smart to pick one of them

just asking are you a boy or girl?

HI!!

why don't you pick \(x\) that is what the math teachers usually use

then

7% of \(x\) is \(0.07x\) right?
at 6% of \(20,,000-x\) is \(.06(20,000-x)\)

yes, and since the total interest is 1280 you know that
\[.07x+.06(20,000-x)=1280\]

final job is to solve that for \(x\)

yeah but decimals are so annoying

k lets get rid of them by multiplying both sides by 100 to clear the decimals

oh ok, then we can just solve
\[7x+6(20,000-x)=128,000\]

so x is suppose to equal to?

you still have to find \(x\) by solving \[7x+6(20,000-x)=128,000\]

i mean how much does he invest at each rate?

solve for \(x\) and you will know how much is invested at 7%
do you know how to do that?

no

its all too confusing

but its homework and i need to finish it,its due tomorrow that's why i need help to find what x is

Miss Tea scared her off D:
Oh noes

yes

|dw:1439057511466:dw|

120000-6x

minus 120,000 to 128000

or minus 7x to negtive 6x

i don't know would you like to show me?

um 7x+8000-6x?

ugh im so stupid

7+-6x+=8000

oh and uhh
you missed a spot.
x's don't just disappear ;)
HAHA no pun intended

|dw:1439058198385:dw|

is this right

can you show me the equation?

12000

and there you go ^^

Just to make sure, what's 6% of 12000?

idk would youlike to help me lol

Come on -_-
Calculators can do that for you. haha

hahaha i dont have one with me do you

okay, to get 6% of something, multiply it by 0.06
Now, what's 6% of 12000?

720

Right.
What's 7% of 8000?
Multiply by 0.07
;)

but i need to find how much does he invest at each rate

Didn't you already do that?
You defined x as the amount he invested for 7% and you got... what?

What is x?

560

That's 7% of 8000 lol

8000?

now add them up. 560 and 720 and you get?

1220

I don't think so?

1280

And that's exactly how much interest he was supposed to earn, as per your problem.
Good job!

but thats how much he yielded

i need to find how much he invest at each rate

which is 1280

that is what i put as my answer

no.
Look back to the equation you solved. You got a value for x.

8000

That's right.

and that is the value of x

and that's how much he invested at 7%

oh thank you your so smart

i need help with one more question

;)

i think i need a one on one tutor like you

There are plenty of those. Here.
They'll only be too happy to help you...sometimes all at once haha