Systems of Linear Equations on the SAT — Fast & Easy Desmos Calculator Tricks, 2 examples solved

Описание: In this SAT Math practice video, we dive into systems of linear equations — one of the most common and score-boosting topics on the test.

You’ll learn how to:

Recognize when to solve by hand and when to use the Desmos calculator efficiently.

Substitute and eliminate variables step by step to solve for x and y.

Handle questions where the equations look messy or time-consuming.

Use the Desmos graphing calculator to instantly find intersection points and verify your results.

We also cover practical SAT tips like why using a keyboard on test day is faster and how to avoid common mistakes when entering decimals.

Whether you’re just starting SAT Math prep or aiming for a perfect 800, this walkthrough gives you a clear, fast problem-solving method that actually works under exam pressure.

⏱️ Timestamps

00:00 – Introduction to systems of linear equations
00:00:11 – What systems of linear equations are
00:00:20 – Strategy overview: how to approach these SAT questions
00:00:31 – When to solve by hand vs. when to use the Desmos calculator
00:01:02 – Using Desmos to solve linear systems efficiently
00:01:12 – Example Problem #1: Solving for x step-by-step
00:02:01 – Substituting y = 21 − x into the equation
00:02:24 – Simplifying and solving for x
00:02:48 – Finding the final answer: x = 13
00:03:53 – Alternative approach explained (solving for y first)
00:04:00 – Why the shortcut method is better on the SAT
00:04:03 – Example Problem #2: Solving for y using Desmos
00:04:57 – Typing equations in Desmos efficiently (keyboard tip)
00:05:32 – Reading intersection points on Desmos correctly
00:05:44 – Final answer explained: y = 2.5
00:06:09 – Important note: decimal vs. comma notation on the SAT
00:06:27 – Final tips for accurate typing and problem-solving

🔗 Useful Links

👉 Digital SAT Verbal Course (Udemy):
https://www.udemy.com/course/digital-...

👉 Digital SAT Math Course (Udemy):
https://www.udemy.com/course/digital-...

👉 Official Bluebook App (College Board):
https://bluebook.collegeboard.org/

👉 20 Digital SAT Practice Tests:
https://practiceprep.io/product/20-di...


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