Question

The pair of values below is from a direct variation. Find the missing number.

(2,5) and (4,y)

Answer 1

Direct variation is form \(y = kx\), where k is some unknown number.

So first, we need to find k. We are given known point \((2,5)\), so plug that;

\(5 = k(2)\quad\Longrightarrow\quad k = \dfrac52\)

Now we know k, we can solve for y from point (4, y);

\(y = \dfrac{5}{2}(4)=~?\)

Answer 2

Y= 10 simple :/