Question

If (x1, y1) and (x2, y2) satisfy xy = k, then x1y1 = x2y2, find y2.

(18, 2) and (x2, y2), if x2=y2

a.y2 = +-6
c.y2 = 0
b.y2 = +-1
d.y2 = -6

Answer 1

if x2 = y2
then x1y1=y2y2
so 18*2 = y2y2 solve for y2

Answer 2

explain

Answer 3

(y2)^2 = 18*2
so y2 = square root of (18 times 2) = ?

Answer 4

so +-6

Answer 5

correct

Answer 6

can you help me with the next one please

Answer 7

is this a test or something?

Answer 8

If (x1, y1) and (x2, y2) satisfy xy = k, then x1y1 = x2y2. Find x or y as indicated.

(x, 25) and (5, 125)
a.x = +-16
c.x = 17
b.x =+-25
d.x = 25

Answer 9

no homework

Answer 10

plug in x1=x
y1= 25
x2= 5
y2=125
into x1*y1 = x2*y2

Answer 11

x1, y1) and (x2, y2) satisfy xy = k, then x1y1 = x2y2. Find x or y as indicated.

(3, y) and (18, 6)
a.y = 36
c.y = 32
b.y = -42
d. y = -16

Answer 12

one question at a time please
I really don't like it when people aim to only get answers and refuse to learn when I am trying to teach.

Answer 13

ok sorry

Answer 14

the answer is 1

Answer 15

If (x1, y1) and (x2, y2) satisfy xy = k, then x1y1 = x2y2. Find x or y as indicated. (x, 25) and (5, 125)

plug in
x1=x
y1= 25
x2= 5
y2=125
into x1*y1 = x2*y2
what would you get?

Answer 16

25

Answer 17

yes

Answer 18

would it just be 25 or +-25

Answer 19

there were no square roots involved when going through the process
so only positive

Answer 20

next question

Answer 21

x1, y1) and (x2, y2) satisfy xy = k, then x1y1 = x2y2. Find x or y as indicated.
(3, y) and (18, 6)

plug in
x1=3
y1=y
x2=18
y2=6
into x1*y1 = x2 *y2
what you do get?

Answer 22

a 36

Answer 23

yes

Answer 24

are you getting the hang of this?
do you see the pattern of how to solve these sorts of problems now?

Answer 25

If (x1, y1) and (x2, y2) satisfy xy = k, then x1y1 = x2y2. Find x or y as indicated.

(3.6, 5) and (7.2, y)

Answer 26

see how (x1, y1) and (x2, y2) match up
with (3.6, 5) and (7.2, y)
^ ^ ^ ^
plug it in that way
into x1*y1 = x2*y2

Answer 27

2.5

Answer 28

correct

Answer 29

z varies jointly as x and y and inversely as w. Write the appropriate combined-variation equation, and find z for the given values of x, y and w.

z = 10 when x = 5, y = -2 and w = 3; x = 8, y = 6 and w = -12

Answer 30

eh
sorry but you're better off posting that in a separate question post
I am not familiar with inversely and jointly stuff, sorry

Answer 31

ok