Name: 表中的斜率和截距 (Slope and intercept in tables)
Uploaded: 2021-01-14T10:14:12.000Z
Duration: 2 min 20 s
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- [Instructor] Flynn's sister loaned him some money,

過去簡單式

基礎數量詞

Flynn graphed the relationship between how much time

had passed, in weeks, since the loan and how much money

how long it took Flynn to pay back the loan?

Pause this video, see if you can figure that out.

All right, now let's go through each of these choices.

how much do we change in the vertical direction

for any given change in the horizontal direction.

And then that happens over the next week.

And that rate of how quickly the loan is paid,

of the entire time period is what makes this a line,

is that slope is always going to be constant.

but it's not the clearest way to figure out

how long it took Flynn to pay back the loan.

The x-intercept, that's where the graph intersects

which is often referred to as the x-axis.

that tells us, that says, what is the x-value

when our vertical value, our y-value, is equal to zero?

So it says, hey how much time has passed when we owe,

or when Flynn doesn't owe any more money to his sister?

Well that's exactly what they're asking for.

How long did it take Flynn to pay back the loan?

And that's what that x-intercept tells us.

After four weeks, he didn't owe any more money

So I like this choice, but let's just review

The y-intercept, well that's where the graph

This tells us what's going on at time t equals zero.

when the horizontal variable is equal to zero,

So this one isn't valuable for figuring out when he,