Adirect variation goes through the points (1,4) and (2, 8) the constant variation is

Given points: (1,4) and (2,8)

Direct Variation:

The statement y varies directly as x, which means that when x increases, y increases by the same factor.

In other words we can say that, y and x always have the same ratio;

i.e, ; where k is the constant of variation.

or we can write this as :                              ......[1]

Substitute the value of given points in [1];

For (1,4)

put x =1 and y = 4 we get;

or

k =4

For(2,8)

put x = 2 and y= 8 in [1];

Divide both sides by 2;

4 = k or k =4

As you can see that a direct variation goes through the points (1,4) and (2,8) , the constant variation in both cases is, k =4.

answer

explanation

the area of a circle is calculated using the formula

or

we can use any of the above formulae to calculate the required. preferably, let us use the latter since the diameter is

we substitute the diameter into the formula to get:

this is the exact value for the area of the circle.

the correct answer is a

answer: ur v dumb

step-by-step explanation: