Question

WILL FAN AND MEDAL
Point C is located at (1, 2) and point D is located at (−4, −2). Find the x value for the point that is 1 over 4 the distance from point C to point D.

−0.25

3.25

−3.75

1.25

Answer 1

- 3.75 i think

Answer 2

I know the answer, it's -0.25 , but I dont understand why

Answer 3

Good I got the -0.25 but i was confident in the answer. Do you still need help?

Answer 4

Yes, I want to understand how to do it.

Answer 5

oops that was wrong re drawing

Answer 6

i understand how to plot the points,

Answer 7

what is the x on the graph and how does the x is 0.25 down and 0.25 from c = -0.25, and what is the x2

Answer 8

Sorry I am making more of this than it actually is...

calculate the delta X which is 5
1/4 of 5 is 1.25
subtract 1.25 from point C's x value which is 1

1 - 1.25 is - 0.25

Answer 9

Did that makes sense?

Answer 10

No, not really, what is a delta

Answer 11

Sorry I was having OS issues....

delta is a term used for the change of or difference between

so delta X is just X at Point C minus the X at Point D

1 - -4 = 5

Answer 12

Oh ok, I think I get it now

Answer 13

A easier way to look at this is similar triangles....


if you move a quarter distance along the hypotenus you move a quarter distance along the X and the Y directions.

Answer 14

Ok I understand the last part the most, but are you able to do it the same way for other problems.

Answer 15

A more complex thing to do is calculate the slope of the line

y = mx + b m = rise over run delta y / delta x = 4 /5

y = (4/5)x + b calculate b by using know x and y values solving for b

2 = (4/5) 1 + b
2 - 0.8 = b b =1.2

equation of the line is y = 0.8 + 1.2

with the equation you can plot the graph using a graphing calculator

and figure out X for different values of Y

Answer 16

Yes do you have another example?

Answer 17

No I only had the one, I can look for one, but Im trying to prepare for my mosule 6 DBA today

Answer 18

Point E is located at (2, −3) and point F is located at (−2, −1). Find the y value for the point that is 3 over 4 the distance from point E to point F.

Answer 19

I also have to do a quick sketch, but I will just do it on paper.

Answer 20

What is delta Y?

(-1) - (-3) =

Answer 21

So the Y value we want is 1/4 from F towards

Answer 22

SO a quarter of 2 is 0.5

Since the line is sloping down .... subtract 0.5 from -1