-3x = 4y is the answer 
Because: 
-3 (-4) = 4 (-3) 
-7 = -12
        
             
        
        
        
The volume of the given composite figure is: 375 m³.
<h3>What is the 
Volume of a Composite Figure?</h3>
Volume of the composite figure = volume of triangular prism at the bottom + volume of rectangular prism at the top.
Volume of the composite figure = 0.5 * b * h * length + (l)(h)(w) 
= 0.5 * 5 * 4 * 5 + (13)(5)(5) 
= 50 + 325
Volume of the composite figure = 375 m³
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the answer is line symmetry