A Car Company Has Found That There Is a Linear $y=b+m x$

Short Answer

A car company has found that there is a linear relationship between the amount of money it spends on advertising and the number of cars it sells. When it spent 50,000 dollars on advertising, it sold 425 cars. Moreover, for each additional 10 thousand dollars spent, they sell 15 more cars. Let $y=b+m x$ be the formula for the number of cars sold as a function of $x$ , the amount of money spent on advertising. Then $b=―――$ and $m=―――$