Step 1 :The slope of the line is 3.5, representing Geoff's rate of travel.
Step 2 :Using the point-slope form of a linear equation, we substitute the values into the equation: y - 18 = 3.5(x - 5)
Step 3 :Simplifying the equation, we get: y - 18 = 3.5x - 17.5
Step 4 :Rewriting the equation in point-slope form, we have: y = 3.5x - 17.5 + 18
Step 5 :Simplifying further, we get: y = 3.5x + 0.5
Step 6 :Therefore, the equation in point-slope form is y = 3.5x + 0.5.