Question

There is an inverse relationship between x and y. If y is 20 when x is 2, what is x when y is 8.

5
8
40
80

Answer 1

@Jaynator495

Answer 2

d

Answer 3

A line has a vertical change per unit of horizontal change of -5/4 and passes through point (2,2) which is another point on the line?

(-3,6)
(-10,8)
(8,-10)
(6,-3) @Jaynator495

Answer 4

im no good at that sorry :(

Answer 5

Could you tag anyone you know?

Answer 6

@aum

Answer 7

If x and y have an inverse relationship it implies the product of x and y is a constant. That is, \(x_1*y_1 = x_2 * y_2\).
Thus, \(2 * 20 = x_2 * 8\). Find \(x_2\).

Answer 8

C?

Answer 9

Can you show the steps?

Answer 10

I have no idea how to do this

Answer 11

Simplify the left hand side. What do you get?

Answer 12

I don't get any of it.

Answer 13

Sorry, I can't just give out answers.

Answer 14

Show me how to work t out. I'm only n 5th grade

Answer 15

The left hand side is 2 multiplied by 20. You should be able to multiply two numbers.

Answer 16

40

Answer 17

Yes.
\(2 * 20 = x_2 * 8 \\
40 = 8 * x_2 \\
\)
Divide both sides by 8:
\(5 = x_2\)

So the answer is 5.

Answer 18

Wait.. i need help one the second question. Not the first

Answer 19

The answer posted for the first question by the previous person is wrong.

Answer 20

Yeah I know. I needed help on the second question

Answer 21

"A line has a vertical change per unit of horizontal change of -5/4"
is just another way of saying the slope of the line m = -5/4
The general equation of a line in slope-intercept form is: y = mx + b
Put m = -5/4
y = -5/4 * x + b ----- (1)
This line passes through the point (2,2). Put x = 2 and y = 2 in equation (1) and solve for b first.

Answer 22

Wooo.. that make no sense to me

Answer 23

Tell me the part you want to be explained. If you are trying to solve this problem by now you should be familiar with slope, y-intercept, equation of a line in slope-intercept form, etc.

Answer 24

If you are given the x and y coordinates of two points, do you know how to find the slope of the line passing through those two points?

Answer 25

Then you have to go through your notes or book and catchup on basic concepts such as: slope of a line, y-intercept, equation of a line, etc. before you can understand or solve this problem.