This is a program for the TI-83 Plus and TI-84 Plus. In order to use it, you must have one of these calculators, a cable to connect it to your computer, and TI-Connect (free download here: education.ti.com/en/us/products/computer_software/connectivity-software/ti-connect-software/tabs/overview)
If you like this program, please consider purchasing my package of 40 programs here - CRAMER is included: https://www.teacherspayteachers.com/Product/40-Programs-for-TI-83-Plus-TI-84-Plus-SATACT-Algebra-through-Calculus-2493682
•Solves systems of linear equations in two or three variables. (The program does this by a method known as Cramer's Rule, which is why it is called 'CRAMER'.)
Yes, you are allowed to use this calculator and its programs on the SAT and ACT. When the new SAT begins, it will still be allowed, but only on the calculator section.
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5 (instructions) + program