Your help is needed on this question lil to hard for me

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Markita needs to determine the dimensions of a rectangular plot of land to be fenced along a lake, using 100 meters of fencing for three sides while achieving an area of 500 square meters. The equations derived from the problem are 2a + b = 100 for the perimeter and ab = 500 for the area. To solve for the dimensions, one can express b in terms of a and substitute it into the area equation. The solution will yield the dimensions of the plot, rounded to the nearest tenth of a meter. Assistance in solving this system of equations is requested.
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Heres the question ... your help is greatly needed and appreciated ...

Markita wants to fence a rectangular plot of land along side the shore of a lake. Only 3 sides must be fenced, since the lake will form teh lake will form teh fourth side. Markita had 100m of fencing, and she wants the plot of land to have an area of 500m^2 (squared). Find teh dimensions of the plot of land, to the nearest tenth of a metre. Expalin and justify your solution.


Theres thequestion , lmk what u can do to help me out ... Thx
 
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basically, we know that 2a+b=100, meaning that the 2 sides opposite each other (that are also equal) plus the third side will equal 100 feet of fencing.
We also know that ab=500, as the area of a rectangle is found by multiplying adjacent sides. Solve the system.
 
Gah! Please don't triple post either!

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woah now... spamming...
 
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