This activity is also part of one or more other Books. Modifications will be visible in all these Books. Do you want to modify the original activity or create your own copy for this Book instead?
This activity was created by '{$1}'. Do you want to modify the original activity or create your own copy instead?
This activity was created by '{$1}' and you lack the permission to edit it. Do you want to create your own copy instead and add it to the book?
lijn keer lijn is parabool, of niet?
Schuif met de blauwe en rode knoppen. Kijk wat er gebeurt met de parabool. Kun je de knop zo verschuiven, dat de parabool verdwijnt?
Wat is er dan met de helling (of richtingscoëfficiënt) gebeurd?