Equation (2) y = 2x - 5 is linear equation.
Equation with the highest power of x = 1 is a linear equation.
It is linear because it forms a straight line.
Equation (3) y = x² + 6 is not a linear equation.
Equation with the highest power of x = 2 is a curve, specifically a parabola curve.
It is not a linear equation because it is a curve.
