The area of the triangle is 27cm.
Y=mx+b
b=y intercet or wwhere the line intercepts the y axis
you want this to be negative so it will be les than zero so cross out any answer with b is positive
its decreaseing so therefor the slope is negative
the answer is the third on which is y=-1/9-5
180° is a straight line :)
100 liters if each would make 200 liters, each liter being worth 40 cents