Question

Which of the following has a constant of proportionality of 2?

y = 2x

y = x + 2

2y = x

y + 2 = 2x

Answer 1

y= X + 2 has a constant proportionality of 2
hope it's helpful to you..

Answer 2

Answer :

$y = 2x$

As we know that : when y is directly proportional to x then :

$y = kx \\ \\ where \: k \: is \: a \: constant \:$

On putting 2 in the place of k :

$y = 2x$

Thus, this equation satisfied the given statement and others equation are not satisfying the statement.

So, the Answer is option (A)