Question

Resolva os sistemas

{x²+y²=5
{x²-y²=1

Answer 1

x² +y²  = 5
x² - y²  = 1
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2x²  //   = 6
x² = 6/2 = 3
x = +-V3 ***

(V3)² + y² = 5
3 + y²  = 5
y² = 5 - 3
y² = 2
y = +-V2 ****