Question 18 from SAT Digital Practice Test 1, Module 1, Section 2

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This is the answer to question 18 from the SAT Digital Practice Test 1, Module 1, Section 2. The question is "The graph shows the relationship between the number of shares of stock from Company A, x, and the number of shares from Company B, y, that Simone can purchase. Which equation could represent this relationship?" This problem involves linear equations, standard form of linear equations, and graphing. Calculators ARE allowed on this section. This practice test is provided for free by the College Board. This video will show you how to do this problem and the logic behind it.

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Why did we multiply both sides by 12 at last? We could have multiplied by any other number, but why 12?

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