How do i model and solve algebriac expressions?

1) Identify what your variables and constants are.

2) Examine the relationship between them (i.e. positive or negative).

3) The variables always go with "x", for example: Timmy works in an electronic store and makes $60 every day (constant) and additionally, he makes $10 for every computer he sells (variable). Notice the word "every", this hints at what your variable is. So, in this example your equation would look like this: y = 10x + 60

Hope that helps!