Question

Please helppp!

Answer 1

help with what?

Answer 2

With the image above.

Answer 3

Have you answered any of the questions so far?

Answer 4

No, i dont understand it.

Answer 5

Okay.
y = safe load in pounds
x = length in feet for a horizontal beam
k = a constant of proportionality such that y=k/x

Answer 6

So 1200=k/20 ??

Answer 7

for problem 30, yes!

Answer 8

so what is k equal to?

Answer 9

60?

Answer 10

No, 24000?

Answer 11

if
1200=k/20
we solve for k and get
k=20 * 1200 = ?

Answer 12

yes.....24000.

Answer 13

Now going back a moment. Did you answer question 29?

Answer 14

No.

Answer 15

okay, it is asking how x is related to y in the equation y=k/x

Answer 16

Do you know what a direct relationship between x and y means? that if x increase, what does y do?

Answer 17

Im not sure? direct?

Answer 18

If y increases as x increases, for example, in the equation y=3x, that is a direct relationship.

Answer 19

In the equation y=k/x, as x increases, what happens to y?

Answer 20

Im confused.

Answer 21

As x gets larger, the ratio k/x gets smaller (remember, k is a constant value). So as x gets larger, y becomes smaller. y and x are related in a inverse manner. As one gets big the other gets smaller and vice versa.

Answer 22

If the equation was y = 1/x, as x gets bigger, y would get smaller, right?

Answer 23

Oh ok. So for 31, y=800

Answer 24

yes, so if y is 800 and k is 2400, what is x?

Answer 25

30?

Answer 26

yes!

Answer 27

How about problem 32?

Answer 28

60 lbs?

Answer 29

yes!

Answer 30

do you have to do 33?

Answer 31

yeah. So what would the equation be, so i can find the graph?

Answer 32

wouldnt it be the first graph? with just a straight line going through 0?

Answer 33

I can't see the graphs, but probably.
We know the equation is
y = 24000/x
so from problems 31, and 32, you already have 2 points, (30, 800) and (40, 600) so you can check those against the graphs.

Answer 34

Oops, I just realized that you dropped a zero on your answer to question 32. It should have been 600 pounds.

Answer 35

I also realized that I wrote 2400 instead of 24000 for k up above in one of my responses. Hope that didn't confuse you.

Answer 36

So are you all set?