Which graph shows the solutions of 4x-6 > 2x– 9?

Kevin and randy muise have a jar containing 78 coins, all of which are either quarters or nickels. the total value of the coins in the jar is $13.90. how many of each type of coin do they have?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

How do you use the elimination method for this question? explain, because i really want to understand!