Can you please me understand why change in equilibrium price is indiscriminate (unable to be determined) in situations where both demand and supply increase or decrease. I would like to understand the key concepts around demand and supply in economics. I need a good explanation for this question.

Changes in Demand and Supply (cont'd) . When both demand & supply increase - Change in equilibrium price is indeterminate - Equilibrium quantity increases unambiguously . When both demand & supply decrease - Change in equilibrium price is indeterminate - Equilibrium quantity decreases unambiguouslyFigure 4-1 Shifts in Demand and in Supply: Determinate Results, Panel (a) Panel (a) Increase in Demand Copyright 2014 Pexrson Education, Inc. All rights resended. Figure 4-1 Shifts in Demand and in Supply: Determinate Results, Panel (b) Panel (b) Decrease in Demand