Write function rule and find k.
1) z varies jointly with x and y, and
when x=2 and y=3, z=72

z = 12xy

Step-by-step explanation:

Given z varies jointly with x and y then the equation relating them is

z = kxy ← k is the constant of variation

To find k use the condition when x = 2 and y = 3, z = 72, that is

72 = k × 2 × 3 = 6k ( divide both sides by 6 )

12 = k , then

z = 12xy ← equation of variation

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.

the answer is 13/48

step-by-step explanation: