math
posted by mlb on .
The length of a rectangle is 3 in. more than twice its width. If the perimeter of the rectangle is 18 in., find the width of the rectangle.

2w=l3
2w + 2l=18
solve. 
Thank you.
Can you help me with this one:
Stan invested $13,000, part at 17% and part at 2%. If the total interest at the end of the year is $1,910, how much did he invest at 17%? 
Let Y = amount invested at 17%.
Then 13,000  Y = amount invested at 2%.
Y + (13,000  Y)*0.02 = 1910.
Solve for Y.
Your questions are likely to be ignored if you post follow questions to an earlier one. It is better to post a different question under Post a New Question rathan than to piggy back on one to which a response has been given. 
Correct, I do not understand how to solve for Y

Ok thank you
Now I am completely lost 
You don't understand something about the answer? What? Please be specific.