Question

which of the following equations is linear? x^2+5=yy=x y=2^xy=1/3x

Answer 1

A linear function will only have variables with exponent 1, then, the following are linear functions:

$\begin{gathered} y=x \\ y=\frac{1}{3}x \end{gathered}$

while

$x^2+5=y$

is a quadratic function and

$y=2^x$

is an exponential function.