X= {(2,4), (3, 4), (4, 4), (5, 4)} is x a function and why?
no, each set of ordered pairs in this list has the same second element
yes, there is more than one ordered pair in this list.
yes, no two ordered pairs in this list has the same first element.
no, there is a limited number of ordered pairs in this list.

Yes, no two ordered pairs in this list has the same first element.

We know that x is a function but it is not ONE-TO-ONE because the y coordinate of each point is the same or repeated.

answer: the price of one pound cabbage = $ 0.8

the point (10,8) represents that the cost of 10 pounds cabbage is $ 8

step-by-step explanation:

since, here is a proportional relation between the number of pounds of cabbage (x) and the price in dollars (y).

therefore, we can write,

⇒ y = k x

where k is the constant of proportionality.

now, point (5,4) is in the line.

thus, it will satisfies the above equation of line.

⇒ 4 = 5 k

⇒ k = 0.8

thus, the equation of the line is,

y = 0.8 x

a) for x = 1,

y = 0.8

therefore, the cost of one pound of cabbage is 0.8 dollars.

b) in the below graph (10,8) represents that the cost of 10 pounds of cabbage is 8 dollars.