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Of four points are collinear, they are also coplanar

Refer to interactive solution 17.45 to review a method by which this problem can be solved. the fundamental frequencies of two air columns are the same. column a is open at both ends, while column b is open at only one end. the length of column a is 0.504 m. what is the length of column b?

Solve 2x+y=3 x+y=5 in substitution method