## 1. equation

### 1.1. y is an equation of a straight line

### 1.2. m and c are constants

1.2.1. m is the gradient of the line

1.2.1.1. steepness of slope

1.2.2. c is the y - intercept

## 2. intercept

### 2.1. x - intercept is where the point of the line cuts the x - axis

### 2.2. y - intercept is where the point of the line cuts the y - axis

## 3. gradient ( part 1 )

### 3.1. positive gradient

3.1.1. + ve

3.1.2. line sloping up to the right

3.1.3. m > 0

3.1.4. as x increases , y increases

### 3.2. negative gradient

3.2.1. - ve

3.2.2. line slopping down to the right

3.2.3. m < 0

3.2.4. as x increases , y decreases

### 3.3. the positive and negative gradient can be in decimal , fraction , irrational or rational number.

## 4. gradient ( part 2 )

### 4.1. the greater the value of m , the steeper the graph

### 4.2. angle of inclination

4.2.1. graph with the greatest angle of inclination

4.2.2. graph with the least angle of inclination

## 5. calculating gradient

### 5.1. a line joining 2 points with coordinates

5.1.1. A ( x1 , y1 )

5.1.2. B ( x2 , y2 )