Question

Which of the following equations have a constant of proportionality equal to 2?

• A. y = 2x
• B. y = x+2
• C. $yx=\frac{1}{2}$
• D. y+2=2x

Answer 1

The correct option is A

y = 2x

y = 2x has a constant of proportionality equal to 2.

y = x+2 is neither a case of direct proportion nor a case of inverse proportion.

$yx=\frac{1}{2}$ has a constant of proportionality equal to $\frac{1}{2}$

y+2=2x is neither a case of direct proportion nor a case of inverse proportion