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Een formule van de vorm y = ax + b afleiden uit een grafiek
[b][i][color=#1551b5]Stappenplan[/color][/i] om een [i][color=#1551b5]formule van de vorm y = ax + b[/color][/i] af te leiden [i][color=#1551b5]uit een grafiek[/color][/i].[/b]