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These guided notes cover how to find the determinant of a 2x2 and a 3x3 matrix, and how to use Cramer's Rule to solve a system of linear equations in two or three variables. I used them in an honors precalculus course, but they could be adapted for use in an advanced algebra 2 course or a non-honors precalculus course. There are enough examples so that you can demonstrate each skill, then have the student practice that skill before moving on.