Let's use the "elimination by addition/subtraction" method to solve this system for x and y.
<span> -8x=72-16y             
4x=-92+16y        <= Mult. all 3 terms by 2:          8x = - 184 + 32y
Now combine the following, column by column:
</span><span> -8x=       72-16y
</span>8x = - 184 + 32y
-----------------------
   0 = -112 + 16y.  Solving for y, 16y = 112, and y = 7.
Now subst. 7 for y in either of the original equations and calculate x:
<span>4x=-92+16(7)   =>   4x = -92 + 112  =  20.  Then x = 5.
Solution is 5, -7   (or, better written) (5, - 7).</span>
        
             
        
        
        
Answer:
You need to write an equation to find the answer to this:
h = hours
48 + 13.5h = 112.50               -First you need to subtract 48 from both sides
48 - 48 + 13.5h = 112.50 - 48
13.5h = 64.5         -Now divide both sides by 13.5
13.5h / 13.5 = 64.5 / 13.5
h = 4.77777778
However, I would just round to 5.
I hope this helps!
-Mikayla
 
        
             
        
        
        
Answer:
Yes, they are equalent
Step-by-step explanation:
12:14 = 6:7
60:70 =6:7
both can be simplified to 6:7
 
        
             
        
        
        
(1/3)x =16 (x represents the total number of books he has)
x=48