## 1.1 Straight Line Graphs

### Straight Line Graphs

- Relationships of the form: y=mx+c, where m is the
**gradient**and c is the**y-intercept**, can be modelled graphically as a**straight line**.

Example

Above is the graph for the linear relationship: y=-2x+1

### Intercepts

- Two points which are often of interest in graphs are the points at which they cross the x-axis, and where they cross the y-axis. These are known as the
**x-intercept**and**y-intercept**, respectively. - To find the x-intercept given a formula, set y to 0 and solve for x.
- To find the y-intercept given a formula, set x to 0 and solve for y.