If x2 + y2 =86 and x y = -16 find the value of (x-y)2

54 is the value of (x-y)^2

Step-by-step explanation:

Given:

Equation 1:

Equation 2: xy = - 16

Multiply Equation 2 with 2 on both sides: 2xy = -32

Find value of(Equation 3) :

Put the value of equation 1 and equation 2 in equation 3

i.e.

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.