We know that
A relationship between two variables, x, and y,<span> is proportional if it can be expressed in the form y/x=k or y=kx</span>
in this problem
k=2
then
y=2x
therefore
the answer is the option
y=2x
        
                    
             
        
        
        
Hey there
Lets solve this question together, 
Convert <span>76.8%</span><span> to a decimal.
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 Multiply 0.768<span> by </span>x<span> to get </span><span>0.768x</span><span>. 
</span>
 
 Multiply<span> each </span>term<span> by </span><span>1 / 0.768</span><span> and simplify.
</span>
Cancel the common factor of 0.768.
 
 Divide 40.32<span> by </span>0.768<span> to get </span><span>52.5 
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24 x 30 = 720 sq. ft
36 x 108= 3888  sq. inches
3888 inches divided by 12 inches= 324 ft.
720 ft - 324 ft. = 396 ft is the yard only without the garden