Answer:
[tex]1+3x=y[/tex]
Step-by-step explanation:
Let the number of coins Margo has be represented by = y
Let the number of years she is adding coins be = x
So, the situation says,Margo has a coin collection. She was given 1 coin as a gift, and she adds 3 coins per year, the equation becomes:
[tex]1+3x=y[/tex]