Question

Rezolvati prin medoda substitutiei x+y=8 si x-y=2 unde x= ? si y=?

Answer 1

Răspuns:

Explicație pas cu pas:

x-y=2         x=y+2

x+y=8      y+2+y=8           2y=6   y=3   x=5

Answer 2

x+y=8 =>x=8-y =>x=8-y =>x=8-y

x-y=2 x-y=2 8-y-y=2 -2y=2-8

=>x=8-y =>x=8-y =>x=8-y

-2y=-6|•(-1) 2y=6 y=3

=>x=8-3 =>x=5

y=3 y=3

=>S={5;3}