1. Xét tính đơn điệu của các hàm số sau: A. y= 3-2x x+7 . 4 5 y = (x ^ 2 - x + 1)/(x - 1)
B. y = (x ^ 2 - x + 1)/(x - 1)
C. y = x + sqrt(16 - x ^ 2)

option 1 is correct.

step-by-step explanation:

y varies inversely with x and constant of variation is 4

the equation will be:

y = k/x

where k =4 so,

y = 4/x

if we put values of x of option 1 in the above equation and find values of y

y = 4/-2 => y =-2

y = 4/-1 => y = -4

y = 4/1 => y = 4

y = 4/2 => y =2

so, all the values of x and y are correct.

if we put values of x given in other options and find value of y we cannot find whole table satisfying the equation.

hence option 1 is correct.

it would take 5 hours i think idk i'm not that good at math.can you me with my questions i need asap.