Расчет: TWoUXm - 1

x1* x2+ y1* y2 =
0

x1* x2+ y1* y2 = 0 $x1\cdot x2+y1\cdot y2$ = 0

x1* x2 = 0- y1* y2 $x1\cdot x2$ = $0-y1\cdot y2$

x1* x2 = - y1* y2 $x1\cdot x2$ = $-y1\cdot y2$

x1 = -

y1* y2

/ x2

$x1$ = $-\frac{y1\cdot y2}{x2}$