Question

calcule x e y em (2 x y -3) . (4 -5) = (-2 -1)

Answer 1

(2xy -3)×(-1)= -2 -1
(2xy -3)×(-1)= -3
2xy × -1 -3× -1= -3
-2xy -3× -1= -3
-2xy +3= -3
-2xy= -3 -3
-2xy= -6
xy= -6 ÷ -2
xy= 3