Set 5: Linear Functions

Choice A is correct. Choice A is the correct answer. Use differences in the table. 1. Change in y: $9- 5 = 4$. 2. Change in x: $4- 2 = 2$. 3. Slope: $\frac{\Delta y}{\Delta x} = \frac{4}{2} = 2$. Strategic Tip: Don't just look at the y-change! You must divide by the x-change. Choice B is incorrect because it is just $\Delta y$. Choice C is incorrect because it is $\frac{\Delta x}{\Delta y}$. Choice D is incorrect because it is $\frac{\Delta x}{\Delta y}$.