Question

resolva o sistema

a) {-x+y=1
{×.y=6

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Answer 1

resolução!

- x + y = 1 ______ y = 1 + x

x.y = 6

x ( 1 + x ) = 6

x + x^2 = 6

x^2 + x - 6 = 0

∆ = 1^2 - 4 * 1 * (-6)

∆ = 1 + 24

∆ = 25

X = - 1 + √∆ / 2

X = - 1 + √25 / 2

X = - 1 + 5/2

X = 4/2

X = 2

Y = 1 + x

Y = 1 + 2

Y = 3

S = { X = 2 e Y = 3 }