<span>
<span>1st</span></span><span> formula 2n + 3m = 280 
</span><span><span>
</span><span>2nd</span></span><span> formula 2n + 5m = 320 
</span><span><span>
</span><span>rearrange 1st</span> formula to equal n:</span>
    <span><span>2n = -3m + 280 
</span>
     </span><span>n = -3/2
m + 140 
</span><span><span>
</span><span>rearrange 2nd</span> formula to equal n:</span>
 <span><span>2n = -5m + 320 
</span>
</span><span>n = -5/2m + 160 
</span><span><span>
so now you have
</span>-3/2m + 140 = -5/2m + 160 </span>
<span><span>Rearrange to become:
</span>
</span><span><span>-3/2m + 5/2m = 160 - 140 
</span>
</span><span>m = 20 
</span><span>
</span>
<span>Now place 20 into the very 1st</span><span><span> equation in place
of the letter m
</span>
</span><span><span>2n + 3(20) = 280 
</span>
</span><span><span>2n + 60 = 280 
</span>
</span><span><span>2n = 220 
</span>
</span><span>n = 110 
</span><span><span>
</span>so it costs $110 per night, $20 per meal</span>
 
        
             
        
        
        
Well the answer for the square root of 11 
irrational number
and real number