4. Find

To find , simply plug into the function :

So, .

Also, it’s interesting to note that linear functions like have a constant rate of change, represented by the slope, which is in this case. This means for every increase of in , the output increases by .

In real life, understanding linear functions can help in various fields like economics for cost analysis or in physics for calculating distance over time. For example, if you were planning a budget and knew your expenses change at a certain rate, you could model your future expenses with a linear equation much like this one!