Het boek wil dat de hoek hier afgerond wordt op gehele graden, zoals te zien in de
antwoorden. De vraag geeft dit niet echt duidelijk op. Ik gebruik bij hoekgraden normaal
gesproken twee cijfers achter de komma (twee decimalen), tenzij anders gevraagd.
1 2
a. 𝑥 − 3𝑦 = 2 → −3𝑦 = −𝑥 + 2 → 3𝑦 = 𝑥 − 2 → 𝑦 = 3𝑥 − 3
Merk hier op dat de aanliggende (verschil in x) altijd 1 is (rekent makkelijk). Wanneer je een
grotere stap neemt in x dan is dit een vermenigvuldiging en moet je diezelfde
vermenigvuldiging toepassen bij y. Dit blijft dus altijd in verhouding.
16.5 Vergeet hier niet de modus van de rekenmachine op radialen te zetten!
1 2
a. 𝑥 − 3𝑦 = 2 → −3𝑦 = −𝑥 + 2 → 3𝑦 = 𝑥 − 2 → 𝑦= 𝑥−
3 3
1
𝑚=3
1
Hoek: tan−1 (3) = 0,32 𝑟𝑎𝑑
b. −3𝑥 = −𝑦 + 7 → 𝑦 = 3𝑥 + 7
𝑚=3
Hoek: tan−1 (3) = 1,25 𝑟𝑎𝑑
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