Write three functions. in the first function, y should vary directly with x. in the second function, y should vary inversely with x. in the third function, the relationship between x and y should be neither inverse variation nor direct variation. describe the graph of each function and give a real-world example for each.

1) y should vary directly with x

y = kx ------ > that means that when x increases, y increases or vice versa by the same factor k

Example--- >  A car runs x hour with speed 5 m/h --> Distance y =  5x

2) y should vary inversely with x

y = k/x ------ > that means that when x  increases, y decreases or vice versa by the same factor k

Example------- > A distance of 360km can be covered 

Y=360/x------ > y is the speed of a car at time x and 360 is the proportionality constant

3) the relationship between x and y should be neither inverse variation nor direct variation

y = 1.8x +32

Temperatures in degrees Fahrenheit are linearly related to those in degrees Celsius, but the relation is neither directly nor inversely proportional.

see the attached figure to see the graph

the answer is 62

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10