If P(6,-2), Q(-2,8), R(-4, 3), S(-9, y), find the value of y so that PQ RS

(note i put the graph in so plz )the graph shows the amount of water that remains in a barrel after it begins to leak. the variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. what is the slope of the line

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

What is the difference between the predicted value and the actual value