Algebra-1

Question Analysis
This question involves determining whether the given equation  is linear or nonlinear based on its graph. The main focus is on understanding the characteristics of linear and nonlinear equations, particularly how their graphs differ.

Key Concept Explanation
Linear equations are polynomials of degree 1, meaning the highest power of the variable x is 1. Their graphs are straight lines, and they can be written in the form  (slope-intercept form), where m is the slope and b is the y-intercept.
Nonlinear equations are polynomials of degree 2 or higher (or other forms like exponential, logarithmic, etc.). Their graphs are not straight lines; for degree 2 equations (quadratics), the graph is a parabola.

Step-by-step Solution
1. Identify the degree of the equation:
The given equation is 

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