Question

1

Mario has to buy oranges at the grocery store. Oranges cost $1.15 per pound.

How much will Maria spend on oranges?

Dependent variable:

Independent variable:

Equation:

Answer 1

Dependent variable: Amount of oranges (
`y`), measured in pounds.

Independent variable: Money (
`x`), measured in US dollars.

Equation:
`y = 1.15\cdot x`

Explanation:

According to the statement, Maria pays money to buy oranges at the grocery and there is a direct proportionality between money (
`x`), measured in US dollars, and the amount of oranges (
`y`), measured in pounds. That is:

`y \propto x`

`y = k\cdot x`

Where
`k` is the proportionality constant, measured in US dollars per pound.

The dependent variable is the amount of oranges (
`y`), whereas money (
`x`) represents the independent variable. If we know that
`k = 1.15\,(USD)/(pd)`, then the equation is:

`y = 1.15\cdot x`

In a nutshell, the answer is:

Dependent variable: Amount of oranges (
`y`), measured in pounds.

Independent variable: Money (
`x`), measured in US dollars.

Equation:
`y = 1.15\cdot x`