Linear equations will generally follow the form: y= mx + b
Lets extract the information we have and try to fit it into the linear equation.
The town has a yearly decrease of 2.5 that fits very well as the slope of our line m= -2.5
The desired number of wrecks is 10. That is the output of our linear function. y= 10
The tricky one is what to do with the original amount of wrecks per year. If we set 1998 as our "zero" on the x axis, the 26 becomes the y-intercept. b = 26
Put it all together and we get 10 = -2.5x + 26 Solve for x to determine the number of years. Remember some questions will ask what year it occurred in You will have to add the result of x to your original year 1998.