How do i solve this by using substitution? y=4x-9y=x-3

Is it possible for 2 lines with negative slopes to be perpendicular? Why or why not?

State the postulate or theorem of

Jacob completes 5 math problems every 30 minutes. He wants to know how long it will take to complete 8 math problems. If he works at the same pace, how long will it take him?

Malia did push-ups and pull-ups in her physical education class. She did 24 push-ups and pull-ups combined, with each push-up taking her 2 seconds and each pull-up taking her 4 seconds.

A realtor is paid a base salary of $20,000 a year plus 10 percent commission on all property sales. What are the sales needed to ensure ab annual income greater than $50,000?

If 50empty soda cans weigh 3 & 1/2 pounds how much would 70 empty soda cans weigh

How do I do 42 divided by 96.6

Lanika needs a sheet of card that is at least 3/10 mm thick. At home she finds some card but she doesn't know how thick it is.

The doctor order 100mg of Rocephin. Available is 1g/1mL. How many mL is to be administered?

Mr. Theorem writes the expressions Six to the second power divided by 2m on the board. what is the value of this expression when the value of m=3