Enter an expression in the box to Write the equation of the line perpendicular to y=-3x-1 that passes through the point (3,4). Y = ?

When conducting an investigation to determine which type of fertilizer produces the most flowers on a plant, which variable would be graphed on the x-axis once you collected the data? a. type of fertilizer b. amount of flowers c. amount of water d. number of days that the plants grew