exam Maths Puzzle Numerical Ability

if you know the perimenter and length of the rectangle then how do you find the area and the width ?

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Please, I need some help with these problems. If anyone can help please.

1. {4x+y=13
{2x-y=5

2. {2x+4y=6
{5x+10=15

3. {x+y-z=-1
{-4x-y+2z=-7
{2x-2y-5z=7 Stu has twice as much money invested in stocks as in bonds. Stocks earned 8% interest per year and bonds 2% per year. If Stu earned a total of $400 dollars from his stocks and bonds last year how much money did he have invested in stocks?