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{x+y=4
{-2 x +y= -5
3;1 bo:
3+1=4
-2*3+1= -5
4=4
-5=-5
{x+y=4
{-2 x +y= -5
3;1 bo:
3+1=4
-2*3+1= -5
4=4
-5=-5
{-2x+y=-5
{x=4-y
{-2(4-y)+y=-5
{x=4-y
{-8+2y+y=-5
{x=4-y
{3y=-5+8/:3
{x=4-y
{y=1
{x=3
{y=1
b){-x+y=7
{x-2y=4
{-x+y=7
{x=4-2y
{-4+2y+y=7
{x=4-2y
{3y=7+4/:3
{x=4-2y
{y=4
{x=4-8
{x=-4
{y=4
c) {2y=-x+5
{3x+6y=15
{2y=-x+5
{3x=15-6y/:3
{2y=-x+5
{x=5-2y
{2y=-5+2y+5
{x=5-2y
{x=5
{0=0