K1E 9.2 and 9.3

• Wiskunde
• Middelbare school
• havo
• Leerjaar 1

K1E 9.2 and 9.3

Welcome K1E

Today:

-Check on homework 9.1

Instruction 9.2 Simplifying formulas

Time tot work

Instruction 9.3 Working with formulas

Time to work

Goal of this lesson

At the end of this lesson:

-you know what terms and variables

-How to simplify a formula

- How to calculate a result of a formula

What did we learn friday about shortening formulas. Name two things

Shorten this formula:
costs = time x 7 + 25

Terms and variable

Like terms

Examples

f = 5a +6b - 3a

f = 2a + 6b

y = 7x + 8 -2x + 4 + 4x

y = 9x + 12

Write this formula shorter:
t = 4k - 3 - 6k + 8

1t = t  and -1t = -t

Write this formula shorter:
p = -3n+4-2n+5+4n

Time to work on 9.2

9.3 working with formulas

Examples

calculate b for t=5 in the next formula

b = 3t-8

b= 3t - 8     b= 3 x 5 - 8

b= 15 - 8

b = 7

calculate k when m=-4
k = 3m - 10

calculate k when t = 3
k=2(4t-5)+6

Time to work on 9.2 and 9.3

Write this formula shorter:
r= 4t + 7 + 5t -3

Calculate r when t = -2
r= 9t + 4