3.1 finding the equation for a line

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 2

x + y + z = ?

Learning goals

I am able to draw the graph given a linear function.

I understand y = ax + b.

Consider the fucntion y = x + 2
Find a point on the function's graph.

I am able to draw the graph given a linear function.

Not yet

Just a little, for now

Getting there

I gots it

Lines in Geogebra and y = ax + b

functions in the form y = ax + b are, for  example:

y = 3x - 1, y = -10x + 3, y = 1/2x etc.

I will use Geogebra to show you how changing a and b affects a linear graph.

What is b in the linear function y = 3x - 1?

1. 3
2. -1
3. 1
4. it is unknown

Which is true for the graphs of y = 3x - 1 and y = -3x - 1?

1. They're parallel.
2. They have the same x-intercept.
3. They have the same y-intercept.
4. They're identical.

Which is true for the graphs of y = x - 1 and y = x - 2?

1. They're parallel.
2. They have the same x-intercept.
3. They have the same y-intercept.
4. They're identical.

Go for that mileage!