Funcions elementals. Rectes Lesson Slides: 4 Slides

4 Slides • 6 Questions

1

Funcions elementals

Rectes

2

Equació d'una recta a partir de dos punts

A (1, 2) B (3, 8)

Calcular el pendent: m = $\frac{8-2}{3-1}$ = 3 $\longrightarrow$ y = 3x + n

Calcular n (amb A): 2 = 3 · 1 + n; n = -1 $\Longrightarrow$ y = 3x - 1

3

Multiple Choice

Quina és l'equació de la recta que passa per (0, 0) i ( 3, 6)?

1

$y=2x$

2

$y\ =\ \frac{1}{2}x$

4

Multiple Choice

Quina és l'equació de la recta que passa per (-2, 2) i ( 0, 1)?

1

$y=-\frac{1}{2}·\ x+1$

2

$y\ =\ \frac{1}{2}·\ x\ +3$

5

Equació a partir d'un punt i el pendent

A (3, 7) ; m = -2

y = -2x + n

Calcular la n: 7 = -2 · 3 + n; n = 7 + 6 = 13

y = -2x + 13

6

Multiple Choice

Equació de la recta que passa per (-4, 2) i té un pendent m = 5

1

$y=5x+22$

2

$y\ =\ 5x-14$

7

Multiple Choice

Equació de la recta que passa per (-6, 2) i té un pendent m = -3

1

$y=-3x+20$

2

$y\ =\ -3x-16$

8

Equació a partir d'un gràfic

Identificar dos punts
A (0, 2) i B (4, 0)

Calcular m i n

m=-\frac{\text{2}}{\text{4}}=-\frac{1}{2}

i n = 2

y\ =-\frac{1}{2}\ x\ +2

9

Multiple Choice

Equació de la recta. Identifica un punt

1

(0, 0)

2

(2, 2)

3

(-1, 1)

10

Multiple Choice

Equació de la recta

1

y = 2x - 2

2

y = -2x + 2

3

y = 2x

Funcions elementals

Rectes

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