1Tvwo §9.4 Equations

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 1

§ 9.4 Equations

Learning goals:

• You will learn what an equation is
• You will learn how to solve an equation

§ 9.4 Equations

We will continue to build on the work we already did in § 9.1,  § 9.2 and § 9.3!

Equations are similar to formulas.  Only now with just one variable. 

§ 9.4 Equations

The dutch word for 'equation'  is: 'vergelijking'. 

An equation always has an  '=' sign!   

For example:  3 x a = 6    ---->    3a = 6

This one variable we can now calculate!

§ 9.4 Equations

For example:  3 x a = 6    ---->    3a = 6

a = 2

Confused? 

You won't be, if you pay full attention to this Lesson Up!

First we will do a complete exercise together.

Formula versus equation

Examples: 

FORMULA:       c + 7 = b                           EQUATION:           c + 7 = 10

The dutch word for 'equation'  is: 'vergelijking'. 

Equations and formulas always have an  '=' sign!  

Look at a few examples:

1.   3c = 18.     What value is c ?

2.  78 = 15a + 3.   What value is a ?

Are they equally difficult?

a) 0,25 * 9 + 3,90 = € 6,15

b) for the variable d

Final task

a = 4t + 45

If you know that a = 63, then what is the value of t ?

Spinner in Magister

SOLUTION Final task:

a = 4t + 45

If you know that a = 63, then the equation is:

63 = 4t + 45

4t = 63 - 45 = 18

t = 18 : 4 = 4.5        

Homework:

Choose your path: Ch 9.4

Also Check your work with the Solutionsbook!