exam Maths Puzzle Numerical Ability

find the volume of a rectangular prism that is 4 feet high, 6.5 feet wide, and 8 feet long

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exam Other Question

here is the problem 1 is less than or equal to -w/2
My question is in the answer the variable is switched to the
other side.
I am asking why?
Solve the system by addition.

5x - 3y = 13
4x - 3y = 11