- #1
Aladin
- 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
How can I solve this equation involving two variables?
- Thread starter Aladin
- Start date
Click For Summary
Homework Help Overview
The discussion revolves around solving a system of equations involving two variables, specifically the equations 3x² + xy - y² = 81 and x + y = 7. The subject area pertains to algebraic manipulation and problem-solving techniques.
Discussion Character
- Exploratory, Assumption checking, Mathematical reasoning
Approaches and Questions Raised
- Participants suggest finding one variable in terms of the other and substituting it into the equations. There are inquiries about the nature of the problem and requests for clarification on the original poster's understanding and approach.
Discussion Status
The discussion includes various suggestions for approaching the problem, with some participants emphasizing the need for the original poster to show their work. There is a mix of responses, with some questioning the level of difficulty of the problem and others offering hints without providing direct solutions.
Contextual Notes
Some participants express concern about the appropriateness of the problem for the stated level of study, indicating a potential mismatch between the problem and the original poster's self-identified learning stage.
- #2
- 15,524
- 768
We don't do your homework here. Show some work, please.
- #3
Dark Fire
- 40
- 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
- 25,837
- 258
Aladin said:
Hi Aladin!
Hint: do the easy equation first.
So x = … ?
- #5
symbolipoint
Homework Helper
Education Advisor
Gold Member
- 7,655
- 2,088
Find y in terms of x and substitute...
- #6
shamrock5585
- 200
- 0
this isn't even precalculus its basic algebra
- #7
Aladin
- 77
- 0
it is not my home work I am just trying to solve it because I am learning basic math.so please help me in solving this equation
- #8
konthelion
- 238
- 0
Just follow everyone's advice and solve find x in terms of y or vice versa y in terms of x and substitute back into your equation.
- #9
shamrock5585
- 200
- 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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