Answer:
He was given $60 for his birthday.
Step-by-step explanation:
The given equation is 
y represents the amount of money and x represents the number of deposits
The equation 
where m is the slope and b is the y intercept
The coefficient of x is the slope
the number without any variable is the y intercept

In the given equation , 60 is the y intercept
60 is the initial money deposited
He was given $60 for his birthday.