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Analyze relationships between variables


Miram is studying a type of plant that grows at a constant rate. Every month, she visits two of these plants and measures their heights. She made this table:
Plant A's height (cm)222426
Plant B's height (cm)262830
Miram wants an equation she can use to find Plant A's height in centimeters (a) given Plant B's height in centimeters (b).
Complete Miram's equation.