Use substitution to show that 9+6(10-7x) is equivalent to 69-42x

Karianne and lucius are analyzing a linear function on a graph. karianne says that unit rate is equal to rate of change, but that slope is calculated differently. lucius says that unit rate, rate of change, and slope are calculated the same way. who is correct? explain your answer.

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50.