How many solutions are there for y=-8+4x y=4x+6

Find the mass by adding the numbers from the three sliders

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions

How to know which equation of motion to use where?explain