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2x-y=10
x= -2-3y
2(-2-3y)-y=10
x= -2-3y
-4-6y-y=10
x= -2-3y
-7y=10+4
x= -2-3y
-7y=14/:(-7)
x=-2-3y
y= -2
x=-2-3*(-2)
y= -2
x=-2+6
y= -2
x=4
y= -2
{2x - y = 10
{x = -3y - 2
{2(-3y - 2) - y = 10
{x = - 3y - 2
{-6y - 4 - y = 10
{x = - 3y - 2
{-7y = 10 + 4
{x = - 3y - 2
{-7y = 14 /:(-7)
{x = - 3y - 2
{y = - 2
{x = - 3 * (-2) - 2
{y = -2
{x = 6 - 2
{y = -2
{x = 4
{y = - 2