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Hi everyone,
since two days I'm following the lesson 18.01SC and I don't really understand this:
In Session 2, Clip 2 he explaines that to get the xintercept of the triangle you have to use this formula:
y  y0 = m (x  x0)
with:
y = 0, because it is an intercept with the xaxes.
y0 = 1/x0
m = 1/x0^2
x = x
x0 = x0
But I don't get why it is y  y0 and not just y0 and why it is m (x  x0)...
Could someone please help me with this? If it is a bit of a stupid question, I'm sorry.
 one year ago
 one year ago
Hi everyone, since two days I'm following the lesson 18.01SC and I don't really understand this: In Session 2, Clip 2 he explaines that to get the xintercept of the triangle you have to use this formula: y  y0 = m (x  x0) with: y = 0, because it is an intercept with the xaxes. y0 = 1/x0 m = 1/x0^2 x = x x0 = x0 But I don't get why it is y  y0 and not just y0 and why it is m (x  x0)... Could someone please help me with this? If it is a bit of a stupid question, I'm sorry.
 one year ago
 one year ago

This Question is Closed

jgoldsmithBest ResponseYou've already chosen the best response.1
Let's start by looking at the formula in question. M represents slope, which is defined by the rate of change of y divided by the rate of change of x, or rise over run. Since rate of change requires change over some period, you need two points: an initial point (x0 or y0), and a change point (x or y). From the definition and the statement above you get the equation \[m = \frac{ (y  y0) }{ (x  x0) }\] Multiplying both sides of the equation by (x  x0) yields the formula you are referring to, \[yy0 = m(xx0)\] , Which as you see follows from the original statement. Do you understand now?
 one year ago

WiskomenBest ResponseYou've already chosen the best response.0
Hi, thanks for you question, I think I understand it now... If I find an other problem that I can't figure out, I'll be back here. Thanks you so much!
 one year ago
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