Question

Which equation does not represent a linear function of x ?

Answer 1

$The\ linear\ function\ represent\ an\ equations:\\\\y=mx+b;\ Ax+By=C;\ Ax+Bx+C=0$

$therefore:\\A)\ y=2x^3-3\to\boxed{NO}\\\\B)\ y=\frac{4}{3}x\to\boxed{YES}\to y=mx+b\\\\C)\ y=\frac{x}{4}=\frac{1}{4}x\to\boxed{YES}\to y=mx+b$

Answer 2

Y=2x³-3 
Any equation where the x is squared or cubed would make a curve on a graph. :)