Angelo is trying to save up to buy the new iPhone 11. He has $40 in his wallet. He decides to shovel snow off driveways for $30 per house to earn some money. Use this information to solve the problems below.
-Which equation models the situation?

y = 30 + 40x
x = 40 + 30y
x = 40 +30y
y = 40 + 30x