Answer:
The answer is B. Equation I only
Explanation:
Looking at our three-equation we can see if they are linear, or by graphing the equations. You could make a table by having input/output values (x,y) meaning plugin x = 0 into the equation to get y = a number just to confirm it to help graph if you can't use graphing calculator.
I have used Desmos Graphing Calculator to graph them for a visual view in demonstrated these equations are different from each other.
i. y = 2/3 x is surely a linear line. The slope is 2/3.
ii. y = 3x^2 is a parabola.
iii. y = 3/x is something. I forgot the name of it.