Asked by RiRi
What are the first few steps to solving this system by the substitution method?
xy=3
x^2+y^2=10
xy=3
x^2+y^2=10
Answers
Answered by
drwls
Substitute 3/x for y in the second equation, and solve the resulting equation for x.
x^2 + 9/x^2 = 10
x^4 - 10x^2 + 9 = 0
(x^2 - 1)(x^2 - 9) =
x = 1, -1, 3 or -3.
x^2 + 9/x^2 = 10
x^4 - 10x^2 + 9 = 0
(x^2 - 1)(x^2 - 9) =
x = 1, -1, 3 or -3.
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