Types of Relations

• Middelbare school

What type of relations do you know ? 

• Linear
• exponential 
• Quadratic

Give an example of a linear formula

Stand up if you know how to write an exponential formula

7.1 Quadratic formulas

If you look at a table and see that the differences between the numbers on the bottom row are not equal then you know it is not Linear.

Now look at the differences between these differences. Are they equal? 

Then you know that the table corresponds to a quadratic formula.

7.2 Directly and inversely proportional

Directly proportional y=cx 

y-intercept is zero so goes through origin

Inversely proportional (when product of variables is constant)

xy = c 

can also write y=c/x or x = c/y

7.3 Fractional formulas

The graph of a fractional formula is a hyperbola.

The graph has two branches.

It also has two asymptotes. 

See theory on page 255 and 256

ex 16 t/m 20

7.4 Power formulas

7.5 Square root formulas

7.6 Tables and formulas

p.272 Summary exercises S1 t/m S7

p.276 Test yourself exercises T1 t/m T7