Students sold 400 tickets to the spring band concert. The students sold adult and child (under 12 years old) tickets. Each adult ticket was $5.00 and each child ticket was $2.00. The total amount of money earned from the sale of tickets was $1475. Please choose the correct set of equations.
a)
{5x+2y=1475
{x+y=400
b)
{5x+2y=400
{x+y=1475
c)
{5x=4002
{x=1475
d)
{x+2x=400
{y+5y=1475