Question

What is the solution set of x^2 + y^2 = 26 and x − y = 6?

{(5, -1), (-5, 1)}

{(1, 5), (5, 1)}

{(-1, 5), (1, -5)}

{(5, -1), (1, -5)}

Answer 1

I think C @caozeyuan

Answer 2

nope D, C is not valid for second equation

Answer 3

there are all sorts of tricks to help you like this one all choices work for first eqaution so just check on second one

Answer 4

Ahh, I lost my calculator and sometimes plug it in wrong so I'd rather know for sure that it's right.