1TTO §7.3 Linear formulas (part 1)

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§7.3 Linear formulas

 less like me

In this Lessonup 

+    linear graphs and 

+    linear formulas are dealt with

+    following it will make doing §7.3 easier

Given formula:

time in hours x 5 euros + 20 = salary,

The graph for this formula 

number of visits x 3 + 6 = amount

Statement 1:

The graph for this formula is a straight line.

St. 1: The graph is a straight line.

1. true
2. false

8

It is a straight line indeed,

as you see alongside.

number of visits x 3 + 6 = amount

Statement 2:

The roles that is played by the numbers 3 and 6 are about the same.

St. 2: The roles are the same.
(Explanation next slide.)

1. true
2. false

Above 

Above you clearly see that 6 and 3 play a completely different

role in the graph!

Important: (Remember!!!)

+   when a graph is a straight line it is called a LINEAR GRAPH

+   the formula of a linear graph is called a LINEAR FORMULA

Statement 3:

The graph that corresponds to this formula is a straight line.

St. 3: The graph is a straight line.
(Explanation follows.)

1. false
2. true

Above you see that the graph is certainly no straight line.

By the way, this was from exercise 15, so from the previous paragraph.

 time x time + 1 = height 

If you got this wrong, study §7.2 once more!

Homework time

Do  of §7.3 now: ex 17, 19 and 20

1. make  2. correct it well

Questions?

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