Question 1006380
This may help.


Draw the rectangular prism, at front lower left corner, x to the right, y upward, z depth.  Those are the three dimensions.  


Front or back is xy=4, and left or right side is yz=10.


Sum of sides is given area of 48.
2xy+2xz+2yz=48


System of Equations
{{{system(xy=4,yz=10,2xy+2xz+2yz=48)}}}




{{{highlight(xz=10)}}}