SAT Question c362c210: Linear Equations In Two Variables answer and explanation with Desmos solution

Math - Linear Equations In Two Variables - Graph To Equation
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Number of Cornflowers and Wallflowers at Garden Store0246810121416182002468101214161820Number of cornflowersNumber of wallflowers

The points plotted in the coordinate plane above represent the possible numbers of wallflowers and cornflowers that someone can buy at the Garden Store in order to spend exactly $ total on the two types of flowers. The price of each wallflower is the same and the price of each cornflower is the same. What is the price, in dollars, of cornflower?

99
Difficulty:Hard