quadratic graphs

quadratic graphs

1. make a table of values before plotting the graph

2. label the axis clearly and apprpriatley

3. if the line is not straight draw a smooth curve through the points

   • once the line is drawn write the equation next to the line

4. where y and x are variables m and c are numbers

   • m is the gradient
     • c is the y-intercept
       • to find c
         • where it crosses the line
     • to find the gradient do the change in y values / change in x values
   • the graphs of linear functions are straight lines

5. then put the numbers into the equation y=mx+c

6. to workout on a calculator

   • type in the calculation and substitute the m,x,c) for the y values
     • WHEN YOU DO NEGATIVE NUMBERS PUT THE NEGATIVE NUMBERS IN BRACKETS

7. To work out without the calculator

   • write out the equation first
     • then put the numbers in
       • then work out the equation as you go

8. use a sharp pencil

   • plot the points carefully
     • draw a smooth curve that passes through all the points
       • label your graph
         • the shape will either be a U shape or anupside down U shape