Solve using substitution
y=3x-5
2x+5y=-42
       
      
                
     
    
    
    
    
    1 answer:
            
              
              
                
                
Answer:
Solution point is (-1,-9)
Step-by-step explanation:
Put the value of y in the first equation into the second equation.
- 2x + 5(3x - 5) = - 42            Remove the brackets on the left
- 2x + 15x - 25 = - 42            Combine like terms on the left
- 17x - 25 = - 42                     Add 25 to both sides
- 17x - 25 + 25 = - 42 + 25    Do the addition
- 17x = - 17                              Divide by 17
- 17x/17 = -17/17                      Do the division
- x = - 1    
=======
Solve for y
- y = 3x - 6
- x = -1
- y = 3(-1) - 6
- y = -3 - 6
- y = - 9
 
                                
             
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Step-by-step explanation:
I am going to guest 25 mins 
 
        
                    
             
        
        
        
 No, Perry is not using the correct ratio, because 15:17 is not equivalent to 5:7
15 divided by 3 is indeed 5 but divided 17 by 3 does not give you 7, nor a whole number.
I hope this helps.