Key Idea: Finding a Function from Points

When you are given two points and a function type, you can determine the equation by using regression tools or solving algebraically.

General Rule:

• Enter the points into a table (like Desmos).

• Select the appropriate function type (linear, exponential, etc.).

• Use regression to find the equation that fits the points.

Why this matters for the SAT:

This process helps quickly generate equations for modeling situations in word problems, data analysis, or real-world scenarios. Regression ensures accuracy when exact calculations by hand are cumbersome.