Question

Tatiana starts with $8 in her piggy bank and saves $2 per week. Julian starts with $0 in his piggy bank and saves $4 per week.

A. Write an equation to model how much money Tatiana has in her piggy bank after x weeks.
B. Write an equation to model how much money Julian has in his piggy bank after x weeks.

Answer 1

a. y=2x+8

b. y=4x

Explanation:

so think slope form which is y=mx+b (m is the rate times x weeks + b the constant)

well tatiana starts with 8 dollars so that is you constant and then saves 2 times per week so that # of weeks is ur x in this equation making it y=2x+8

and so same thing with julian but this time he stars with nothing so there is no constant but the rate at which he saves times x weeks is 4 so the equation will be y=4x

hope this helps you ;)

Answer 2

A. y=2x+8

B. y=4x

Explanation:

These are both linear equations so use y=mx+b where m is the slope (rate you earn money) and b is the yintercept (starting point).

Tatiana starts at 8 dollars and gains 2 dollars a week so m is 2 and b is 8

Julian starts without any money and gets 4 dollars a week so m is 4 and b is 0