Opvarmning til algebra
For at afbilde en lineær ligning på formen y = ax + b kan vi udnytte de oplysninger, som denne form giver. For eksempel, y = 2x + 3 fortæller os, at linjens hældning er 2, og skæringen med y-aksen er (0,3). Dette giver os et punkt, som linjen går igennem, og retningen vi skal fortsætte fra dette punkt for at tegne hele linjen. Lavet af Sal Khan og Montereys Institut for teknologi og undervisning.
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