Proportion and graphs

Proportional

• You can use the symbol ox to show direct proportion
• You can show quantities that are directly proportional or inversely proportional on a graph

Direct proportion facts

• If y is directly proportional to ox
  • You can write an equation y = kx where k is a number
  • The graph of x against y is a straight line passing through the origin

Inverse proportional facts

• If y is inversely proportional to x
  • You can write y ox 1/x
  • You can write an equation y=k/x, where k is a number
  • The graph of x against y like a reciprocal graph