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Monday, December 5 th. Warm Up. Solve each proportion 1. 2. Please grab a new warm up! Did you write down the homework?. Corny Joke of the Day. Why are most baseball games held at night? Because the bats sleep during the day. Did anyone try this?. For most people, the ratio of the

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monday december 5 th

Monday, December 5th

Warm Up

Solve each proportion

1. 2.

Please grab a new warm up!

Did you write down the homework?

corny joke of the day
Corny Joke of the Day

Why are most baseball games held at night?

Because the bats sleep during the day

did anyone try this
Did anyone try this?

For most people, the ratio of the

length of their head to their total

height is 1:7. Use proportions to test

your measurements and see if they

match this ratio.

weekly review answers

Weekly Review Answers

One week to our final!!!!!!!!!!

rational numbers
Rational Numbers
  • -11
  • -2.44
  • -1 ¼
  • -54
evaluating
Evaluating
  • 2
  • -1.25
  • 1/64
  • -1/86
algebra
Algebra
  • 5 1/3
  • 14/15
  • -2 13/28
  • -17.577
write a rule
Write a Rule
  • -2n-1
  • 5n + 1
  • EXC
  • -10n-15
slide10

Graphing

Get the Point!

slide11

0

You usually call me a

__________________________.

The numbers to the right of my zero are always______________.

The numbers to the left of my zero are always______________.

Number Line

positive

negative

slide12

0

0

You can think of me as a

_________________________.

The numbers above my zero are always______________.

The numbers below my zero are always______________.

Thermometer

positive

negative

the 4 quadrants using i ii iii iv
The 4 quadrants using:I, II, III, IV

There are 4 Quadrants on a coordinate plane!!

I

II

IV

III

slide21

(6,-9)

Quadrant IV

slide24

Direct

Variation

equivalent proportions is direct variation
Equivalent Proportions is Direct Variation!!! !

2/12 is the same as 4 to 24 is the same as 6 to 36….etc. So, this varies proportionally!

not a direct variation
NOT A DIRECT VARIATION

1/6 is not the same as 2/8 or 3/10 or ……….

slide28

Helpful Hint

A direct-variation equation is always linear and always contains the point (0, 0).

The variables x and y either increase together or decrease together.

situations that change proportionally
Situations that change proportionally

Ms. Evans Example: Movie tickets and the total amount of money it’s going to cost

Zero Tickets=Zero dollars

The more movie tickets I buy, the more total money I will have to pay!

group discussion
Group Discussion

Think of a situation that has a direct Variation!

finding the constant k in the equation
Finding the Constant (k) in the equation

Y = kx

Find k when:

  • y=5x
  • Y=1/2x
  • Y=11x
  • Y=.74x
  • Y=4/5x
can you match the correct proportion
Can you match the correct Proportion

a. Y = 3x b. x=3y

c. y=5x d. x=5y

using direct variation to solve problems
Using Direct variation to Solve Problems

The equation below can be used to determine how many boys, y, are in sixth-grade class that has x girls. Y=5/6x

If there are 12 girls in the class, how many boys are in the class?

a. 8 b. 10 c. 12 d. 18