# Pre-calc

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• The problem is y=\sqrt{15-x^4}. You must determine whether the formula determines y as a function of x.
• Holy crap it's Ellen in the flesh. What brings you to Dallas?
• I've always wanted to come here﻿. What is your name and what do you do for a living?
• I teach kids how to math all over the place﻿ and my name is Kinny
• No flipping way, teach me something!﻿
• Okay, you're going to help me determine whether the formula determines y as an x value﻿
• Alright bet﻿
• ﻿How do I solve this?
• If one does not know how graph the problem, begin by entering it into desmos.com. After the graph appears, see if it passes the vertical line test or not. This means that a vertical line cannot touch more than one point on the line at once.﻿ If it passes the test, it is a function.
• So what was the case for this function?﻿
• When placed on the graph, it passed the vertical line test. So this means that yes, it is a function indeed. ﻿
• ﻿What an awesome product!!! Thanks for teaching me how to do math.
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