Question

if y is direclty proportional to x and y =20 when x is 5 find an equation connecting x and y. ​

Answer 1

We have,

$\quad \ \: y \propto x$

$\Rightarrow y = kx \qquad$----(1)

Putting values of x=5 and y=20

$\Rightarrow20 = 5k$

$\Rightarrow k = 4$

Substituting k=4 in eqⁿ (1), we get :

$\boxed{y = 4x}$