Question

exercitiul 2
URGENT DAU COROANA ​

Answer 1

Răspuns:

a)y=5-4x

2x-15+12x=13 ; 14x=28 =>x=2; y=(-3)

b)3x=5-2y =>x=(5-2y)/3

(25-10y)/3 - 3y = 2

25-10y-9y=6

-19y= -19 =>y=1 ; x=1

c)4x=10-2y sau 2x=5-y =>x=(5-y)/2

5-y+3y=1 =>y=(-2); x=7/2

d)4x=2y-2 sau 2x=y-1 =>x=(y-1)/2

(3y-3)/2 + y = -9

3y-3+2y=-18

5y=-15 =>y=(-3); x=(-2)

e)x=(6+3y)/4

(30+15y)/4 - 7y = 1

30+15y-28y=4

-13y=-26 =>y=2; x=3

f)x=-1-3y

-2-6y-y=5

-7y=7 =>y=(-1); x=2

g)x=-13-5y

-26-10y-3y=13

-13y=39 =>y=(-3); x=2

h)x=10-4y

20-8y-5y=-19

-13y=-39 =>y=3; x=(-2)