Final answer:
The correct linear equation to determine Josiah's monthly payment for living in an apartment is Monthly Payment=Rent+Utilities (option a).
Step-by-step explanation:
The correct linear equation to determine Josiah's monthly payment for living in an apartment is Monthly Payment=Rent+Utilities (option a). This equation represents adding the cost of rent and utilities together to calculate the total monthly payment. For example, if the rent is $800 and the utilities are $100, the monthly payment would be $900.