The equation that does not belong with the other three is option d, 3/4x+1/3=y.
The other three equations have a common pattern of having y as a function of x with a specific form of expression.
Equation a has a linear function with a slope of 0.5 and a y-intercept of -0.2.
Equation b represents a linear equation in slope-intercept form with a slope of 4 and y-intercept of 3.
Equation c is a quadratic equation with a leading coefficient of 1, which opens upwards and has a vertex at (-3, 6).
However, equation d has a fractional coefficient and does not have a specific pattern with the other three equations. Therefore, option d does not belong with the other three equations.