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“Find Equation”: Is the alternative method a valid way to solve this, seeing as, given the y intercept, it is implied that b = 3?

Question

Is the alternative method a valid way to solve this, seeing as, given the y intercept, it is implied that b = 3? Looking at the answer choices, only A would satisfy +3. I noticed that this would be less time consuming than the method discussed in the video.

Answer

Yes, that's an absolutely valid method, and in this case saves time.

Link

http://gmat.magoosh.com/questions/825

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