A parabola with a vertex at (0, 0) has a directrix that crosses the negative part of the y-axis. Which could be the equation of the parabola?

A. x² = -4y
B. x² = 4y
C. y2 = 4x
D. y2 = -4x

How do the graphs of y = 1/x and y=5/x+6 compare?

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]

How do you do the foil method with polynomials?