Why is x = y^2- 9 not a function ?
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Let's use the SAS postulate! SAS means Side, Angle, Side. I would sometimes write this the other way and get in trouble, haha.
It technically means if a triangle that has a congruent angle between two congruent sides, it means it is congruent. Here is a picture.
It technically means if a triangle that has a congruent angle between two congruent sides, it means it is congruent. Here is a picture.