create an equation or inequality that could be used for analysis, prediction, or decision making.?

Question

When you are born your grandmother gives you $100 bond. For each birthday she gives you a $25 bond. How much will you have on your 21st birthday?

Answer 1

A simple linear equation will describe this.

y = mx + b

y is the face value of the bonds (in $)
x is time (in years)
b is the starting amount ($100)

y = 25*x + 100

All you have to do is put in 21 for x and solve for y to figure out how much you will have in bonds on your 21st birthday.

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