Answer:
Inequality: 

x=14
Explanation:
Billy charges $15 to mow a yard. 
Billy charges $15 to mow a yard. He needs at least $200 for the new bicycle that he wants. 
Let he bought x number of mow 
Cost of each mow = $15
Cost of x number of mow = 15x 
He had atleast $200
15x should be greater than 200
Inequality form: 

Now we solve for x 

He should buy atleast 14 mow. 
Hence, 14 yards must he mow to make $200