direct and inverse proportion

direct and inverse proportion

1. if 2 things are directly proportionate, increasing one will increase the other proportionately

2. if 2 things are inversely proportionate, increasing one quantity cause the other to decrease proportionately eg if c is doubled, then d is halved

3. this is how you can show proportionality

4. these are some other proportion expressions

5. proportion equations can be easily graphed

6. to do algebraic proportion

   • write the proportion as an equation
     • find a pair of values and substitute them to find k
       • put the value of k into the equation so it is ready to use
         • they will ask you to fin y if you have been given you a value of x or vice versa

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