Think of it as putting the x’s on one side of the (>) it’s best to add the smallest number of x’s first so move the -5x to the other side and add it to the -13x after you get that you move the -9 to the other side so it’ll be 2+9 then you divide to get the x alone
        
             
        
        
        
Answer:
x = -1 and x = 5
Step-by-step explanation:
<em>What are the solutions of the equation (x – 3)² + 2(x – 3) -8 = 0? Use u substitution to solve.</em>
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(x – 3)² + 2(x – 3) -8 = 0   -------------------------------------------------------(1)
To solve this problem, we will follow the steps below;
let u = x-3
we will replace x-3 by u in the given equation:
(x – 3)² + 2(x – 3) -8 = 0  
u² + 2u -8 = 0  ----------------------------------------------------------- --------------(2)
We will now solve the above quadratic equation
find two numbers such that its product gives -8 and its sum gives 2
The two numbers are 4 and -2
That is; 4×-2 = -8    and 4+(-2) = 2
we will replace 2u by (4u -2u)  in equation (2)
u² + 2u -8 = 0
u² + 4u - 2u -8 = 0
u(u+4) -2(u+4) = 0
(u+4)(u-2) = 0
Either  u + 4 = 0
             u = -4
or 
u-2 = 0
u = 2
Either u = -4    or u = 2
But  u = x-3
x = u +3
when u = -4
x = u + 3
x = -4 + 3
x=-1
when u = 2
x = u + 3
x = 2 + 3
x=5
Therefore, x = -1  and  x =5
x 
 
        
             
        
        
        
B. y=4/5x its just taking half
        
             
        
        
        
Yes they are equivalent because their ratio is 9
81/9= 9
63/7=9