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{7-2y=3
{x=7-y
{y=2
x=5
y=2
b)
{2y=2-3x
{3x-y= -10
{y=1-1,5x
{3x-1-1,5x= -10
{y=1- 1,5x
{1,5x= 9
{x=6
{y=-5
c)
{2x+3y=3
{4x+3y= -9
{2x=3-3y
{4x+3y= -9
{x=1,5-1,5y
{4(1,5-1,5y)+3y= -9
{x=1,5-1,5y
{6-6y+3y= -9
{x=1,5-1,5y
{-3y=-15
{y=5
{x=1,5-7,5
{y=5
{x=-6