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Rezolvati sistemul 16. a)

Rezolvati Sistemul 16 A class=

Răspuns :

Iakabcristina2
a)5x+5+7=3y-15+y+3
   5x+12=4y-12
   5x-4y=-24

x²-y²=x²+2x+1-y²+4y-4
2x+4y-3=0
2x+4y=3

5x-4y=-24
2x+4y=3
_________
7x   / =-21 =>x=(-3)

-15-4y=-24
-4y=-24+15
-4y=-9 =>y=9/4