TI-84 Slope Trick: Check If a Point Is on a Line (ACT Hack!)

Here’s a fast way to check whether a point lies on a line using the TI-84.
If multiple points are said to lie on the same line, their slopes must match — and the TI-84’s slope program makes this check instant.

In this video, I show you how to:

✔ Use the TI-84 slope program
✔ Compute slope between two points instantly
✔ Compare that slope to each answer choice
✔ Eliminate wrong options quickly
✔ Confirm the correct point without hand-writing any formulas

If you haven’t created the slope program yet, check out my TI-84 Calculator Programs playlist where I walk you through how to build it step-by-step.

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👉 https://my2tor.com/ti84

🧠 About My2tor
I’m Tina Wiles, test anxiety expert and founder of My2tor & ACTSATPrepHQ.com.
I help students master the mindset, strategy, and content they need to succeed on high-stakes exams like the ACT and SAT.

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⏱ Timestamps
00:00 Intro
00:14 Understanding the line + points
00:21 Using the slope program
00:40 Finding the slope between the first two points
00:54 Matching the slope to answer choices
01:12 Testing each point quickly
01:53 Eliminating wrong options
02:06 Identifying the correct point
02:24 Outro

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