Answer:
The standard form.
Explanation:
Between the standard form and the expanded form the equation that helps find the y-intercept most effectively is the Standard form. The standard form of an equation takes the form of;
Ax + by = C, where A, B and C are constants and x and y are the intercepts.
y- intercept is a point in which x = 0 and then y is determined.
Another equation that helps find the y-intercept most effectively is the POINT -SLOPE form which can be represented mathematically by;
y = mx + c, where c =y- intercept, m = slope = y2 - y1/x2 - x1 and x and y are the axis.
The standard form is efficient because it can describe both zero and constant slope lines while the expanded form can only describe the equation with either zero or constant slope lines.