algebra
posted by running wild on .
Select the set of equations that represents the following situation: Mike invested $706 for one year. He invested part of it at 5% and the rest at 3%. At the end of the year he earned $28.00 in interest. How much did Mike invest at each rate of interest?

I don't see a set of equations...

Select the set of equations that represents the following situation: The cost of eleven CDs and twelve DVDs is $150.62; and the cost of one DVDs and twelve CDs is $116.07. How much do a CD and a DVD cost?
(Points : 3)
11x + 12y = 150.62; 12x + 1y = 116.07
11x • 12y = 150.62; 12x • 1y = 116.07
11x + 12y = 150.62; 1x + 12y = 116.07
11x • 12y = 150.62; 1x • 12y = 116.07