Project Math Access DVD 03 - Algebra - Part 06
Transcript Start
Audio Description: Part six; solving equations using the braillewriter.
TEACHER: Now, number 3. This one you'll do on your brailler. It's find the slope between points A and B.
BRANDON: Find the slope... between point A, and B
TEACHER: Do you remember how to find the slope?
BRANDON: Yeah.
TEACHER: Okay.
TEACHER: Where are the coordinates for points A and B right now?
Audio Description: Brandon reads the equation from a braille sheet.
BRANDON: Oh, they mean points A and B according to number 1.
TEACHER: Right.
BRANDON: Okay, to find the point between negative 3 and negative 5 and negative 1, negative 3. So let's write those points down. Negative 3, 5.
TEACHER: Okay.
BRANDON: That's positive 5...
TEACHER: Now do you have that label as number 3?
BRANDON: I'm sorry if I said negative early.
Audio Description: Brandon uses the braillewriter.
BRANDON: So pointA is... negative 3, 5... negative 3, comma 5... and.....
Audio Description: Brandon checks the braille sheet.
TEACHER: B was negative 1, negative 3.
BRANDON: ...negative 3. Okay. Now, to find the slope we need to... do... The change in Y over the change in X.
TEACHER: Okay.
BRANDON: So we need to subtract... Now remember, it's written X, comma Y... So now we need to subtract our Y's first.
TEACHER: Okay.
BRANDON: And then we need to subtract our X's. And it's written as a fraction. So, the variable we use for slope is "m" So, m equals... negative 3 minus 5... Now please remember this is actually negative 3 plus a negative 5. So, that would be a negative 8 over...
Negative 1 minus a negative 3 so that's actually negative 1,.... plus 3. which is 2. So, negative 8 over 2, which is negative 4.
TEACHER: Good. So m = - 4. Good job.