SOLUTION: A photograph is 12 cm longer than it is wide. It is mounted in a frame 5 cm wide. The area of the frame is 620 cm squared. What is the dimensions of the photo

Question 965121: A photograph is 12 cm longer than it is wide. It is mounted in a frame 5 cm wide. The area of the frame is 620 cm squared. What is the dimensions of the photo

Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
x and y, photograph dimensions.
a, the area of just the frame, alone

, assuming y is length.
Let u be the uniform width of the frame.

Total area frame plus photograph,
area of just the photograph,
area of just the frame,

According to description and assigning,

and through substituting according to description,

Now would be a good step to substitute the given values, compute constant and coefficients and then finish solving for x.
Use as described:
x, unknown photograph width
u=5
a=620
y=12+x
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