Pick the correct graph and equation pleasee!

Given:

Amount of flour in a bin = 30 cups

Flour required for each signature cake = cups

To find:

The correct equation and graph for the given situation.

Solution:

Let F be the amount of flour in the bin and c be the number of signature cakes.

Flour required for each signature cake = cups

Flour required for each signature cake = cups

Flour required for c signature cakes = cups

Amount of flour in a bin is 30 cups and it is reduced by 1.5c cups. So, the amount of flour in the bin is:

At , we get

At , we get

Therefore, the required equation is and the 4th graph is correct.