Question

решить систему xy=-20
x+y=1​

Answer 1

$xy = - 20 \\ x = 1 - y$

$(1 - y)y = - 20$

$y = - 4$

$y = 5$

$x = 1 - ( - 4)$

$x = 1 - 5$

$x = 5$

$x = - 4$

$(x1.y1) = (5. - 4)$

$(x2.y2 = (- 4.5)$