Question

Ex 5 va rog. Am nevoie urgent! Dau coroana ​

Answer 1

a) 2x - 2 + y = -2 => y = -2x => y = -2 (-1) = 2

4x + 3y - 2 = 0 => 4x -6x -2 = 0 => -2x = 2 => x = -1

b) 8 -3x + 2y -2 = -7 => 2y -3x = -13

2x + 7y = -8

le adunam => 9y -x = -21 => x = 9y + 21

2 (9y + 21) + 7y = -8 => 18y + 42 + 7y = -8 => 25y = -50 => y = -2

x = 9 * -2 + 21 = -18 + 21 =  3

c) x + 3y = (83 - 8)/ 90 = 75 / 90 = 15 / 18 = 5/6

y - x = - (16-1)/90 = 15/90 = - 1/6

le adunam => 4y = 4/6 => y = 1/6

x= y + 1/6 => x = 2/6 = 1/3

d) 2x -2y + 4 = 0.5 /6 => 12x - 12y + 24 = 3

12x + 5y - 15 = -2

le scadem => -17y +39 = 5 => -17 y = -34 => y =2

12x + 10  - 15 = -2 => 12x = 3 => x = 4

e) x+ 2y - 6  = -6 =>  x = -2y

x + 2y = 4 => x = -2y + 4 => -2y = -2y + 4 => 0 = 4  contradictie

f) 8x = 3(2y - x) => 8x = 6y -3x => 11x = 6y

3y + 10x - 5y = -x => 11x = 2y

6y = 2y => y = 0

11x = 0 => x = 0

Sper ca te-am ajutat!