Question 1080883
Two points can give one the slope
Change in y is 90000, change in x is -18; slope=-5000
point slope formula y-y1=m(x-x1), m slope, x1,y1 point
y=-5000(x-18)=-5000x+90000
Want when y=70,000, since this represents number of available seats when 20,000 have been sold.
70000=-5000x+90000
-20000=-5000x
x=4 hours. 5000 seats are sold per hour.
After 16 hours, 10,000 seats are left (5000*16)=80000.
or y=-5000(16-18)=-5000(-2)=10000

{{{graph(300,300,-10,20,-12000,100000,-5000x+90000)}}}