@benny.math: Each unknown is just its determinant divided by D: x = 7/7 = 1 y = 14/7 = 2 z = 21/7 = 3 Always check your answer. Plug it into the first equation and 1 + 2 + 3 = 6 ✓ This works for any 3x3 system as long as D isn't zero. If D = 0, Cramer's rule can't give you a unique solution, so you'd switch to another method. The best part is that the process is always the same: four determinants, three divisions, done. It's perfect for exams where you need a reliable routine. Save this for your next linear algebra test, send it to a friend who's struggling with systems, and drop a system in the comments if you want me to solve it next! 👇 #math #maths #mathematics #algebra #linearalgebra

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Monday 21 September 2026 12:34:02 GMT