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{6(x+y)=10y
{y-x=0,5 -> y= x+0,5
{6x+6y=10y
{y= x+0,5
{6x=4y
{y= x+0,5
{6x=4 (x+0,5)
{y= x+0,5
{6x=4x+2
{y= x+0,5
{2x=2 /2
{y= x+0,5
{x=1
{y= x+0,5
{x=1
{y= 1+0,5
{x=1
{y= 1,5
b)
{10(y+2)+3(x-5)=x-5
{25(y+2)+3(x-5)=-10
{10y+20+3x-15=x-5
{25y+50+3x-15=-10
{10y+2x=-10 /2
{25y+3x=-45
{5y+x=-5 /2 -> x = -5-5y
{25y+3x=-45
{x = -5-5y
{25y+3(-5-5y)=-45
{x = -5-5y
{25y-15-15y=-45
{x = -5-5y
{10y=-30 / 10
{x = -5-5y
{y=-3
{x = -5-5 *(-3)
{y=-3
{x = 10
{y=-3