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b) { x+4y=2
3x-y=2

c){ x/2=2/3
6x+4y=3
Va rog ajutati-ma


Răspuns :

Bună,

b) { x+4y = 2 /•(-3)
{ 3x-y = 2

{ -3x-12y = -6
{ 3x-y = 2

-13y = -4
13y = 4
y = 4/13.

x+4y = 2
x+4•4/13 = 2
x+16/13 = 2
13x+16 = 26
13x = 10
x = 10/13.




c) { x/2 = 2/3
{ 6x+4y = 3

x/2 = 2/3
x = 2/6
x = 1/3.

6x+4y = 3
6•1/3+4y = 3
2+4y = 3
4y = 1
y = 1/4.


Succes!
{x+4y=2    3x-y=2
{x=2-4y     3(2-4y)-y=2
{x=2-4y   6-12y-y=2
{x=2-4y   -13y=-4
{x=2-4y   y=4|13
{x=2-4*4|13   y=4|13
{x=2-16|13  y=4|13
{x=10|13   y=4|13


{x|2=2|3  6x+4y=3
{3x=4 6x+4y=3
{x=4|3  8+4y=3
{x=4|3  4y=-5
x=4|3 y=-5|4