please help me in solving this question.
3x^2+xy-y^2=81 ; x+y=7
I will be thankful to you
We don't do your homework here. Show some work, please.
Also it's not a question:
"3x^2+xy-y^2=81 ; x+y=7 ??"
Hint: do the easy equation first.
So x = … ?
Find y in terms of x and substitute...
this isnt even precalculus its basic algebra
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
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.
after you solve in terms of the other with one equation you have to plug in for the other equation
Separate names with a comma.