Answer:
Nonlinear
Step-by-step explanation:
y=2/3 x^2-7 is nonlinear because it is not in slope intercept form.
Also, x² automatically means it is nonlinear because this is the formula for a parabola when graphed. Parabolas are nonlinear.
The parabola also doesn't continue in a straight or nearly straight line. That is what linear is.