W=Y(b+A) , for b
Solve the equation for the specified variable which is b

Step-by-step explanation:

As with any "solve for ..." problem, you undo what is done to the variable of interest. Here, what is done is ...

You "undo" these operations in reverse order (from the bottom of the list up). To undo multiplication, you multiply by the reciprocal:

To undo the addition of A, add the opposite of A:

Step-by-step explanation:

Your essentially just trying to get b by itself.

First, distribute the Y.

Then, divide both sides by Y.

Finally, subtract A from both sides.

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to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart