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What a
In Grade 8, instructional time should focus on three critical areas: (1) formulating and reasoning about expressions and equations, including modeling an association in bivariate data with a linear equation, and solving linear equations and systems of linear equations; (2) grasping the concept of a function and using functions to describe quantitative relationships; (3) analyzing two- and three-dimensional space and figures using distance, angle, similarity, and congruence, and understanding and applying the Pythagorean Theorem.I don't know about you, but I use bivariate linear equations every day.
∑ xy
r = ----------
2 2
√ ∑x ∑y
See? I just used one! Pearson's correlation coefficient.
[Just to be clear, note that in the denominator, it's the square root of the sum of all x's squared times the sum of all y's squared. That was the best square root symbol I could find.]
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