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-9/2y-2y=-13
13/2y=13
y=2
b)2(4y+16)+5y=6
8y+32+5y=6
13y=-26
y=-2
{2x+3y=14/:2
{3x-2y=8
{x+1,5y=7
{3x-2y=8
{x=7-1,5y
{3(7-1,5y)-2y=8
{x=7-1,5y
{21-4,5y-2y=8
{x=7-1,5y
{-6,5y=-13/:(-6,5)
{x=7-1,5y
{y=2
{x=7-1,5*2
{y=2
{x=7-3
{y=2
{x=4
{y=2
b)
{½x-2y=8
{2x+5y=6/:2
{½x-2y=8
{x+2,5y=3
{½x-2y=8
{x=3-2,5y
{0,5(3-2,5y)-2y=8
{x=3-2,5y
{1,5-1,25y-2y=8
{x=3-2,5y
{-3,25y=6,5/:(-3,25)
{x=3-2,5y
{y=-2
{x=3-2,5*(-2)
{y=-2
{x=3+5
{y=-2
{x=8