Question

Daca x+y=1000 si x-y=868, afla valoarea lui x si y.
Calculeaza apoi 2xX-3xy

Answer 1

x+y=1000 x-y=868➡x=868+y➡ inlocuim in prima: x+y=1000➡868+y+y=1000➡ 2y=1000-868➡2y=132➡y=132:2➡y=66➡x=868+66➡x=934

Answer 2

1)

X+Y=1000
X-Y=868
--------------
2X=1000+868
2X=1868
X=1868:2
X=934
934+Y=1000
Y=1000-934
Y=66

2)

2*X-3*Y=
(2*934)-(3*66)=
1868-198=1670
Sper ca te-am ajutat!