math
posted by emily on .
you work at a grocery store. your hourly wage is greater after 6pm than it is during the day. one week you work 20 daytime hours and 12 evening hours and earn $280. another week you work 30 daytime hours and 12 evening hours and earn a total of %276. what is your daytime rate? what is your evening rate?

Let x = daytime rate and y = evening rate.
20x + 12y = 280
Therefore x = (280  12y)/20
30x + 12y = 276
Use the same procedure as indicated in your previous post.