Question

Rezolvati sistemele: a)
$x \times y = 7 \\ x \times y = 12$
b)
$x + y = - 3 \\ x \times y = - 10$
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Answer 1

b) x= -3-y  se inlocuieste in a doua ec

(-3-y) *y= -10    (-3-y)* y= 2 *(-5)

(-3-y)=2    -3-2=y   y= -5