Chapter

Chapter 1
Section

Lectures and Quick Notes(1.1

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Lectures and Notes
10 Videos

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Section Intro

*example 1:* Convert the following into algebra to expressions:

- "+": 4 more than a number
- "-": 4 less than a number
- "
`\times`

": Three "times" a number - "of": Three of a number OR half of a number

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3.57mins

Converting Word into Algebra for Sum Subtraction and Multiplication

**A first example with percentage**

*example:* `60\%`

of the school population is 300. What is the `100\%`

of the population?

Solution:

500 is the population of the school.

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1.51mins

Converting Words into Algebra Equation

**Converting words into Equations**

*example:* Find a number when subtracted by 4 it's the same as when the number has been increased by 3 and then halved.

n = 11

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2.10mins

Converting Words into Equations ex1

How about division?

Typically here is what we do when we talk about division:

- dividend รท divisor = quotient

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Converting Division word programs into Algebra Expressions

**Modelling Cost of items**

Jim is looking to buy a mixture of two coffee beans in StarCoffee. There are two different types of roast: Pike and Blonde. Jim is going to spend a total of `\$24`

on coffee beans. The Pike roast cost `\$8/kg`

and the Blonde roast cost `\$6/kg`

.

(a) Write an equation to represent Jim's purchases.

(b) Isolate the variable for the number of jellybeans in your equation.

(c) If Jim bought 250 g of Pike, how many grams of Blonde did he buy?

(d) If Jim bought 150 g Blonde, how many grams of Pike did he buy?

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4.24mins

Modelling Cost of items

*ex* The length of a rectangle is 4 cm less than 3 times the width. The perimeter is 36 cm. Find the width and length.

Therefore, the width of the rectangle is 5.5 cm and the length of the rectangle is 12.5 cm.

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2.50mins

Geometry Set Up Example

*ex* Two consecutive numbers add up to 55. What are the two numbers?

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1.47mins

Consecutive Numbers

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Graphing Lines

*example:* Find the intersection point between the two lines below.

`\displaystyle y = \frac{1}{2}x -1`

`\displaystyle y = -\frac{3}{4}x + 6`

The two lines share the point of intersection say `(a, b)`

.

Since (a, b) is on both lines they can be now written in terms of `a`

and `b`

in the following way.

`\displaystyle b = \frac{1}{2}a -1`

`\displaystyle b = -\frac{3}{4}a + 6`

Therefore,

```
\displaystyle
\left(\frac{28}{5}, \frac{9}{5}\right)
```

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3.05mins

Intersection of Lines