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