Type the equation the way the stem wrote it. Extra algebra before Desmos is where signs and parentheses go missing. When to open Desmos is in Desmos on the ACT.
Let the graph do the rewrite
If the item is already y = something, graph it. If it is x and y mixed, type that and read intercepts or intersections off the picture. Check what you typed against the stem, not against a rewrite you did in your head.
Keep the handheld for arithmetic, in handheld calculator and Desmos. Policy is in the calculator policy. A second look at the graph is in check your work in Desmos.
The bottom line
Copy the stem into Desmos. Simplify after you see the graph, not before.
Start practicing
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This article offers general ACT prep guidance. The ACT can change from year to year, including its format, scoring, policies, test dates, and fees, so always confirm the latest details on the official ACT website at act.org before you make decisions. ACT® is a registered trademark of ACT, Inc. thirty-six is not affiliated with, endorsed by, or sponsored by ACT.