wspolczynnik-kierunkowy-prostej-prostopadlej-do-prostej-okreslonej-wzorem-y-1dfrac52x-jest

$\dfrac{2}{5}$\dfrac{2}{5}

$-\dfrac{2}{5}$-\dfrac{2}{5}

$-\dfrac{5}{2}$-\dfrac{5}{2}

$\dfrac{5}{2}$\dfrac{5}{2}