Question

DAM NAJ .............................................................. na dzis plis

Answer 1

a)
3x + 2y = 5
2x + 2y = 2      |*(-1)

 3x + 2y = 5
-2x - 2y = -2
---------------------  +    (dodajemy stronami)
x = 3    
2y = 2 - 2 * 3 = 2 - 6
2y = -4      /:2
y = -2

{x = 3
{y = -2 


b)
 x - 2y = -3
2x + 3y = 8

x = -3 + 2y
2(-3 + 2y) + 3y = 8

x = -3 + 2y
-6 + 4y + 3y = 8

x = -3 + 2y
7y = 14    /:2

x = -3 + 2y
y = 2 

x = -3 + 2 * 2 = -3 + 4
x = 1

{x = 1
{y = 2