where is the slope and is the -intercept. We know that Chinquita started with This means that after weeks of savings, she had This value represents the -intercept. The second information is that Chinquita saves each week. Thus, the slope is equal to Let's now substitute these two values into the formula to complete the equation.
The -intercept is where the line of the function crosses the -axis. It can be written as the point To find another point on the line we use the slope,
To finish the graph, we'll draw a line trough the points.
We can see that the amount saved is above Therefore, Chinquita will afford the fan after weeks.