- #1

- 77

- 0

please help me in solving this question.

3x^2+xy-y^2=81 ; x+y=7

I will be thankful to you

3x^2+xy-y^2=81 ; x+y=7

I will be thankful to you

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- Thread starter Aladin
- Start date

- #1

- 77

- 0

please help me in solving this question.

3x^2+xy-y^2=81 ; x+y=7

I will be thankful to you

3x^2+xy-y^2=81 ; x+y=7

I will be thankful to you

- #2

- 15,393

- 686

We don't do your homework here. Show some work, please.

- #3

- 38

- 0

Also it's not a question:

"Hey"

-Hey

"3x^2+xy-y^2=81 ; x+y=7 ??"

-Yes

"OK."

"Hey"

-Hey

"3x^2+xy-y^2=81 ; x+y=7 ??"

-Yes

"OK."

- #4

tiny-tim

Science Advisor

Homework Helper

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please help me in solving this question.

3x^2+xy-y^2=81 ; x+y=7

I will be thankful to you

Hi Aladin!

Hint: do the easy equation first.

So x = … ?

- #5

symbolipoint

Homework Helper

Education Advisor

Gold Member

- 6,234

- 1,219

Find y in terms of x and substitute...

- #6

- 194

- 0

this isnt even precalculus its basic algebra

- #7

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- 0

- #8

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- 0

- #9

- 194

- 0

after you solve in terms of the other with one equation you have to plug in for the other equation

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