Which of the following of ordered pairs represent a function? a = (-5, 5) (-2, 2) (2, -2) (5, -5) b = (4, 2) (3, -2) (9, 4) (11, -3)

A represents a function because each of the input values {-5, -2, 2, 5} has one and only one output (y-) value associated with it.

The same could be said of B: Each of the four input values {4, 3, 9, 11} has one and only one output (y-) value associated with it.

Thus, in both cases the given relations are also functions.

Th

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.