SOLUTION: Hi, my name is Kyle, im having dificulty in math, here are some of my questions, about everyting!!!! Why do we use x? How do we substitute for x? How would we do this equation:

Algebra ->  Absolute-value -> SOLUTION: Hi, my name is Kyle, im having dificulty in math, here are some of my questions, about everyting!!!! Why do we use x? How do we substitute for x? How would we do this equation:       Log On


   

Question 26357: Hi, my name is Kyle, im having dificulty in math, here are some of my questions, about everyting!!!!
Why do we use x?
How do we substitute for x?
How would we do this equation: 5x(3-9x)+4-x??
How do we do inverse operations?
How do I graph a Linear Equation?
What is absolute value?
I get extra help in math-by staying after school...id get like a 40 on a test or a quiz because i dont finish and i dont understand all the questions so i stay after and i get like a 60-75 on it, but my grade is still suffering. I had a 77 in the first marking period, now i have like a 68... i had a 43 but i brought it up, do you have any suggestions of helping me? Please respond asap!! =)
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
why x? we use any old letter we care to. Just so happens x is the most common. No reason you need know about :-)

As for your specific questions, i recommend you read through my Lessons on this website and those of rapaljer. Together, I think we cover most topics and we are clear in our help.

5x(3-9x)+4-x
15x-45x%5E2%2B4-x
14x-45x%5E2%2B4
4%2B14x-45x%5E2

jon.