To find slope use the slope formula. Then, use y=mx+b. Plug in the numbers. 
        
             
        
        
        
Answer:
2362 ...........................
 
        
             
        
        
        
Answer: -7
Step-by-step explanation: y+3x=8x-7
subtract 3x from both sides y=5x-7
y=Mx+b 
b=-7
 
        
             
        
        
        
Factor out the largest perfect square of 32. 
( in this example we factored out 16 )
Rewrite 
____
/16⋅2
as the product of two radicals.
The square root of 16 is 4.
Divide numerator and denominator by 4.
 
        
             
        
        
        
Answer:
the answer is 

cause sin²x= 2/25
so cos²x would be 1-2/25= 23/25
then cos x is what I wrote as the answer