Yes, the equation y = 3x + 10 is a linear equation.
A linear equation is defined as any equation that can be put in the form of y = mx + b, where m represents the slope of the line and b represents the y-intercept. In our case, 3 is the slope, and 10 is the y-intercept.
This means that for every one unit increase in x, y increases by 3 units. The graph of this equation is a straight line, which confirms that it is indeed a linear equation.