Question

Jimmy is selling used books at a yard sale. A customer buys 9 books at a cost of $0. 75 each and pays with a $20. 00 bill. Jimmy must determine c, the amount of change in dollars he should give the customer. Which equation represents c? 20 minus 0. 75 c = 9 20 minus 0. 75 = 9 c 0. 75 (9) c = 20 0. 75 c 9 = 20.

Answer 1

The equation is (0.75)9 + c = 20.

Linear system

It is a system of an equation in which the highest power of the variable is always 1. A one-dimension figure that has no width. It is a combination of infinite points side by side.

Simplification

Simplification is to make something easier to do or understand and to make something less complicated.

Given

Jimmy is selling used books at a yard sale.

A customer buys 9 books at a cost of $0.75 each and pays with a $20.00 bill.

To find

The equation.

How to find the equation?

A customer buys 9 books at a cost of $0.75 each and pays with a $20.00 bill.

Let c be the profit.

Profit = Selling price - cost price

c = 20 - (0.75)9

On simplifying, we get

(0.75)9 + c = 20

So the equation is (0.75)9 + c = 20.

More about the linear system link is given below.

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