Current value : $15,000
Loses per year: $950
number of years: y
He plans to sell his car when it reaches a value of $10,000 or less
Subtract the product of the number of years (y) and the amount lost per year (950) to the current value
15,000-950 y
That expression must be less or equal to 10,000
15,000-950y < 10,000 (A)