How to solve equation?

  • 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
 

Answers and Replies

  • #2
D H
Staff Emeritus
Science Advisor
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We don't do your homework here. Show some work, please.
 
  • #3
38
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Also it's not a question:
"Hey"
-Hey
"3x^2+xy-y^2=81 ; x+y=7 ??"
-Yes
"OK."
 
  • #4
tiny-tim
Science Advisor
Homework Helper
25,832
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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! :smile:

Hint: do the easy equation first.

So x = … ? :smile:
 
  • #5
symbolipoint
Homework Helper
Education Advisor
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Find y in terms of x and substitute...
 
  • #6
194
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this isnt even precalculus its basic algebra
 
  • #7
77
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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
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
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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