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Räta linjen
Punkterna A och B har koordinaterna (a,b) respektive (c,d).
1. Använd glidarna och ändra koordinaterna så att
a) Linjens k-värde blir 2
b) Den räta linjen blir y=-1,5x+3
2. Ställ nu upp ett samband som beskriver k, uttryckt i a, b, c, d.