2a. Lijn l gaat door het punt (4, 4) en staat loodrecht op lijn m met de vergelijking 3𝑥𝑥 − 𝑦𝑦 = −2.
Bepaal de vergelijking van lijn l.
Uitwerking:
𝑚𝑚: 3𝑥𝑥 − 𝑦𝑦 = −2 ⟹ 𝑦𝑦 = 3𝑥𝑥 + 2
⟹ 3 is de richtingscoëfficiënt van lijn m
1
⟹ − is de richtingscoëfficiënt van lijn l
3
1
⟹ 𝑙𝑙: 𝑦𝑦 = − 𝑥𝑥 + 𝑏𝑏
3
2b. De parabool p met vergelijking 𝑦𝑦 = 𝑎𝑎 𝑥𝑥 2 + 𝑏𝑏 𝑥𝑥 + 𝑐𝑐 gaat door de punten (–1, 0), (0, 2) en (1, 8).
Bepaal de coëfficiënten a, b en c.
Uitwerking:
Punten (x, y) invullen in 𝑦𝑦 = 𝑎𝑎 𝑥𝑥 2 + 𝑏𝑏 𝑥𝑥 + 𝑐𝑐:
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