Does the equation y = 7.2x represents a direct proportion?

Step-by-step explanation:

We are given the expression

------- expressing the relationship between y and x

one way to know if the expression shows a direct proportionality is to answer the question, does y increase if x increases?

let us plug two values for x and see what happens to y

for x=3

y=7.2(3)

y=21.6

for x=4

y=7.2(4)

y=28.8

for x= 2

y=7.2(2)

y=14.4

From our observations when  x increases the value of y increases and vice versa, hence there exist a direct proportionality

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)

x = 23.78

step-by-step explanation: