Start by multiplying 3 times 3x to get 9x. Then multiply 3 times -6 to get -18
After that your equation is 18=9x-18
Then your going to add 18 to each side so your equation should be 36=9x 
Then devide each side by 9 so the answer will be x=4
        
             
        
        
        
Answer:
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Step-by-step explanation:
 
        
             
        
        
        
Look for the y-intercept
since we know the slope is 3 we just going to plug in 
-5=3(1)+y
-5-3=y
so the y-intercept is 8 now you can find the equation
y=3x-8
        
             
        
        
        
x-2=7
apply additon property of equality
x-2+2=7+2
x=9