You can eliminate A because Beth gets a raise of 210 dollars per year. You can also eliminate B because the equal sign indicates how much years will it take for Beth and Robert earn the same amount. So now it leaves C and D. You can eliminate C because 79,340 is added to 210y, so each year, y, the raise will be 210 per year. But C uses 840y, which isn’t right. This leaves D to be the right answer. Hope this helps. If you have any questions or concerns, feel free to comment them below!
