Question

Rozwiąż równania 1. x+2/5 -2y =5 x - y+2/6 =3

Answer 1

żle przepisane albo jakiś nowy sposób

 

 

 x+2/5-2y=5 |*5
5x+2-10y=25 -2
5x-10y=23

x-y+2/6=3 *6
6x-6y+2=18 -2
6x-6y=16

Answer 2

x+2/5 -2y =5     /*5

x - y+2/6 =3      /*3

 

5x + 2 - 10y = 25

3x - 3y + 1 = 9

 

5x - 10y = 23    /*3

3x - 3y = 8        /*(-5)

 

15x - 30y = 69

-15x + 15y = -40

-----------------------

-15y = 29

y = -29/15

 

3x - 3y = 8

3x - 3 * (-29/15) = 8

3x + 145 = 8

3x = 8 - 145

3x = - 137

x = -137/3

 

y = 29/15

x = -137/3