The interest earned on an account varies directly with the balance in the account. if an account with a balance of $200 earns $12.50 in interest, find the amount of interest earned on an account with a balance of $500

Step-by-step explanation:

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form or

Let

y-------> the interest earned on an account

x------>  the balance in the account

step 1

Find the constant k of proportionality

For

substitute the values

The equation is

step 2

Find the amount of interest earned on an account with a balance of $500

so

For   substitute in the equation and solve for y

constants mean the stopped points or the points on a graph that nothing is changing, hope this

step-by-step explanation: