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Answer:
Step-by-step explanation:
9y-4 = 50
9y = 54
y= 6
9y-4+7x+xy = 180
9(6)-4+7x+6x= 180
54-4+13x = 180
13x+50 = 180
13x = 130
x = 10
 
        
             
        
        
        
Answer:
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Step-by-step explanation:
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Answer:
15, 8, 25 The teacher payed 0.40 per book.
Step-by-step explanation:
4/10 = 2/5 Simplify the 4/10 to find the unit rate.
15: 2/5 = 6/x Set up your proportion.
     2x   =30 Cross multiply
     /2      /2 Divide both sides by 2 to isolate x
      x     =15
8: 2/5 = x/20 Set up proportion
    40  =5x Cross multiply
     /5     /5 Divide both sides by 5 to isolate x
      8  =x
25: 2/5 = 10/x Set up proportion
       2x  =50 Cross multiply
        /2     /2 Divide both sides by 2 to isolate x
         x   =25
Graph: y=mx+b To graph, you will need to use y=mx+b format
            y= 2/5 x+2 2/5 is your unit rate. Your rate changes every 2 books bought. To graph, start at (0,2) and go up 2 and to the right 5, plot. Continue moving up 2 and to the right 5 to graph.
The teacher payed 0.40 per book because 2/5 simplifies to 0.40.