Answer: so your readers can visualize and experience it..
Step-by-step explanation:
 
        
                    
             
        
        
        
Each time x increases by 2 (eg: from x = -3 to x = -1), the value of y increases by 7 (eg: y = 9.5 to y = 16.5)
Change in y = 7
change in x = 2
Slope = (change in y)/(change in x) = 7/2 = 3.5
This all means that we have a linear equation
        
             
        
        
        
Answer:
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Step-by-step explanation:
 
        
             
        
        
        
The final price is the cost plus the tax.
Since we know the tax and a percent, we can write this as
 
T = C(1+r)
 
T = what Graham paid = $87.45
C = cost before tax 
r = tax rate expressed as a decimal = .40
 
Plugging in what we know
 
87.45 = C (1+.4)
87.45 = C(1.4)
 
Divide both sides by 1.4
 
C = $62.46
 
        
             
        
        
        
6(x+1)=24
6x+6=24
6x=24-6
6x=18
6x/6=18/6
x=3