3ATA H 1.2 lineaire formules present

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 3

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Assignments

O13, O17, T18, A22, O24, O27, A32

In the former lesson you practised .....

Solving lineair equitaions! 

• ....apply the PEMDAS procedure (refer to page 14) 
• ...the former from the top of your head!

today's menu: lineair formulas

p.e: These maths are required for programming a taximeter 

Tariff 1 : EUR 1,50/minuut.  For a ride into the suburbs, the me metr switches herself to EUR 1,50/km  (GPS or mileage)

Our mutual target for this lesson:

• explain the meaning of the word "Gradient" and/or "slope"
• explain the meaning of the word "y-intercept"
• calculate the gradient and the y-intercept
• draw the line  l: y=ax+b for various values of a and b
• find the equation from a set of given coordinates P and Q
• check if a coordinate is positioned on the line "l"

Parallel lines

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www.geogebra.org

compose a line's formula

zelf doen

Bepaal RC (a), startgetal (b)

Denk aan:

• modelformule......................
• snijpt. x-as............................
• twee punten op de lijn kiezen en de rc bepalen
• vul in de modelformule

www.geogebra.org

Apply you knowledge

A line contains P(1,100) and Q (2,-50).
The slope is (1) very large and
(2) positive

1. 1=True, 2 =True
2. 1=True, 2=False
3. 1=False, 2=True
4. 1=False, 2=False

"l" and "m" are parallel lines. The slope is zero (0). What is the value of "a" in l: y=ax+b?

1. Not sufficient info
2. a=90 degrees
3. a=0
4. a= not defined, because extremely large

Line "m" intercepts the y-axis at P(0,8) and the x-axis at Q(8,0). What is the formula for this line?

1. y=-x+8
2. y=x+8
3. y=-8x+0
4. y=8x+8