If y varies directly as x, and y is 20 when x is 4, what is the constant of variation for this relation?

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

These tables represent a quadratic function with a vertex at (0, -1). what is the average rate of change for the interval from x = 9 to x = 10?

The equation |pl = 2 represents the total number of points that can be earned or lost during one turn of a game. which best describes how many points can be earned or lost during one turn? o o -2 2 oor 2 -2 or 2 o