x y Straight Line Graphs m gives the gradient of the line and c gives the y intercept. All straight line graphs are of the form y = mx + c The gradient is defined as the rise/run rise = 2 run = 1 y intercept = 3 y = 2x + 3

x y Straight Line Graphs m gives the gradient of the line and c gives the y intercept. All straight line graphs are of the form y = mx + c The gradient is defined as the rise/run rise = 3 run = 1 y intercept = -4 y = 3x - 4

x y Straight Line Graphs m gives the gradient of the line and c gives the y intercept. All straight line graphs are of the form y = mx + c The gradient is defined as the rise/run rise = 1 run = 2 y intercept = 1 y = ½x + 1

x y Straight Line Graphs m gives the gradient of the line and c gives the y intercept. All straight line graphs are of the form y = mx + c The gradient is defined as the rise/run rise = 1 run = 3 y intercept = -5

x y Straight Line Graphs m gives the gradient of the line and c gives the y intercept. All straight line graphs are of the form y = mx + c The gradient is defined as the rise/run rise = 3 run = 4 y intercept = 2

Consider the straight lines shown below: (a) (c) (b) (d) (e) Can you split the lines into two groups based on their gradients ? Lines (a) (c) and (d) slope upwards from left to right. Lines (b) and (e) slope downwards from left to right. Positive gradient Negative gradient

x y Straight Line Graphs m gives the gradient of the line and c gives the y intercept. All straight line graphs are of the form y = mx + c The gradient is defined as the rise/run rise = 4 run = 5 y intercept = 3

1.y = 2x y = 3x – 5 3.y = -x Y = ½x –2 5.Y = - 4x –9 6. y = ¾x x y Determine the equations of the following lines