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Grade 9/Math/MFM1P1/Final_Exam_Study_Sheet.md
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- Simply divide the first number by the second number, and multiply by one `100`. It is the same as making the ratio into a fraction, then converting the fraction into a percentage.
# Unit 6: Graphing Relations
## Definitions
- `relation`: describes how one variable is connected to another.
- `Axis` (plural is axes):
- Vertical: used for **dependent** variable.
- Horizontal: used for **independent** variable.
- `Variable`: a letter or symbol used to represent a quantity that changes
- **Independent** variable is **NOT** controlled/affecet by another variable
- **Dependent** variable is one that **IS** controlled/affected by the **independent** variable.
- `Trend`: a general direction or tendency
- `Line of best fit`: a **line** that passes as close as possible to a set of plotted points
- a **correlation** describes how well one variable relates to another. Possible types of correltaion:
- positive
- negative
- none
- strong
- weak
- `Curve of best fit`: a **curve** that passes as close as possible to as set of plotted points.
- `Interpolation`: Data **inside** the given data set range.
- `Extrapolation`: Data **outside** the data set range.
## Graphs:
- `Title`: Name given to a graph and placed above the graph.
- `Axis Label`: Axes are labeled with the scale, what was measured and its units.
- `Scale`: evenly spaced numbers which differ by an equal amount. Note: the scale may have a break at the beginning.
## Interpreting Scatter Plots
- A scatterplot graph is there to show the relation between two variables in a table of values.
- A line can be drawn through the most concentrataed points, to show a trend.
- <img src="https://www.varsitytutors.com/assets/vt-hotmath-legacy/hotmath_help/topics/line%20of%20best%20fit-eyeball/lineofbestfit-e-1.gif" width="300">
### How To the Line of Best Fit
1. Find two points **```ON```** the ```line of best fit```
2. Determine the ```slope``` using the two points
3. Use ```point-slope form``` to find the equation of the ```line of best fit```