a computer is worth 2000 new after each year is worth half of what it was the previous year what will its worth be after 3 years​

Can someone explain the elimination method to me for this problem?

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have

Solve by any method (graphing, substitution or linear combination)y = x - 82x + 3y = 1a) (2, -6)b) (5, -3)c) (4, -4)d) (0, -8)i figured it out. the answer is (5, -3)