1718 WB1Y CH10 Lesson 3

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 1

Which exercises should I discuss on the board? Do you have any questions about the theory?

Recap §10.2

Formula -> Equation

Solving equations using cards

The formula to calculate your grade is g = 1 + 0.2p
g is your grade, p is the number of points. Anna gets a 8.6 for her test and wants to know how many points she scored. What EQUATION corresponds to this situation?

Solve the equation 8.6 = 1 +0.2p
Show 2 steps!

Finding values that are difficult to read off from a graph.

1. Make a table and fill in some easy to read off points (grid points!)
2. Make a formula
3. Use the formula to make an equation
4. Solve the equation

For what value of n is a equal to 45?

For what value of n is a equal to 45?

n      0               4
a      20            80

For what value of n is a equal to 45?

n      0               4
a      20            80
60 : 4 = 15
formula is a = 20 +15n

For what value of n is a equal to 45?

n      0               4
a      20            80
60 : 4 = 15
formula is a = 20 +15n
equation is 45= 20 + 15n

For what value of n is a equal to 45?

n      0               4
a      20            80
60 : 4 = 15
formula is a = 20 +15n
equation is 45 = 20 + 15n
                            15n = 25
                             n =

1​3​​2​​

Homework

15, 16, 17, 18
Bring a calculator!