Acar travels 18 miles per gallon of gas used. which equation best represents the proportional relationship between the y miles that the car has traveled and the x gallons of gasoline that it has used?

y = 18x is the required equation.

Step-by-step explanation:

The car traveled = y miles

Gasoline that car used to cover x miles = x gallons

Distance traveled by car is directly proportional to Gasoline used to travel that distance.

that is distance traveled by car  = K× Gasoline used  

Using unitary method,

Unitary method is used to find the value of a single unit.

Distance traveled by car  in one gallon of gas = 18 miles.

Distance traveled by car in x gallon of gas (y) = 18x miles.

Thus,  y = 18x is the required equation.

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.

step-by-step explanation: