Rozwiaż układ równań (x + 5)(y - 2) = (x + 2)(y - 1) (x - 4)(y + 7) = (x - 3)(y + 4)
{(x+5)(y-2)=(x+2)(y-1) {(x-4)(y+7)=(x-3)(y+4)
{xy-2x+5y-10=xy-x+2y-2
{xy+7x-4y-28=xy+4x-3y-12
{-x+3y=8 |*3
{3x-y=16
{-3x+9y=24
____________
8y=40
y=5
{y=5
{3x-5=16
{3x=21
{x=7
SPRAWDZENIE:
{-x+3y=8
{-7+3*5=8
{3*7-5=16
{-7+15=8
{21-5=16
{8=8
{16=16
{(x+5)(y-2)=(x+2)(y-1)
{(x-4)(y+7)=(x-3)(y+4)
{xy-2x+5y-10=xy-x+2y-2
{xy+7x-4y-28=xy+4x-3y-12
{-x+3y=8 |*3
{3x-y=16
{-3x+9y=24
{3x-y=16
____________
8y=40
y=5
{y=5
{3x-y=16
{y=5
{3x-5=16
{y=5
{3x=21
{x=7
{y=5
SPRAWDZENIE:
{-x+3y=8
{3x-y=16
{-7+3*5=8
{3*7-5=16
{-7+15=8
{21-5=16
{8=8
{16=16