If Sam drives his car 171miles in 9 hours, What is his speed ?​

Can someone answer this question? : )

Having a hard time understanding this question (see attachment).

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.