A rectangular picture frame is to be 8 in. longer than it is wide. Dennis uses 84 in. of oak to frame the picture. What is the width of the frame?

1 Answer
Gió
Jan 26, 2016

I found #17"in"#

Explanation:

We can try calling one dimension (the width) #x# so that the other (the length) will be #x+8#;
assuming that #84"in"# is the perimeter of your rectangular frame you have:
Perimeter#=84=2x+2(x+8)# for a rectangle;
rearranging:
#4x+16=84#
#4x=68#
#x=68/4=17"in"#
representing the width of the frame.

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