A)
Odp. (2,3 )
{5x - 2y =4
{3x + y = 9 / *2
{5x - 2y =4
{6x +2y = 18
11x=22 / :11
x= 2
3x + y =9
3*2 + y=9
6+y=9 /-6
y=3
b)
Odp. (-1,0)
{6x + 16y + -6
{-5x + 10y = 5 / * (-1,6)
{6x + 16y = -6
{8x - 16y = -8
14x= -14
x= -1
-5x+10y = 5
(-5)*(-1) +10y = 5
5 +10y = 5
10y = 0
y=0