to make this simple, plug the x-coordinate of each answer choice into x in each of the equations and plug the y-coordinate of each answer choice into y in each of the equations. if BOTH equations come out to be true, this is the solution.
so you were earning say "x", so "x" is the 100% of your paycheck.
but you're da bomb and so you got a raise of 5%, so the new amount of your paycheck is 100% + 5%, so is 105% really, and we happen to know that is $100.
