I can not see the question it is blurry
        
             
        
        
        
The correct answer is m=-2 (slope) and b=4 (y-intercept).
        
             
        
        
        
You wouldn’t because 3 is the base number and cannot be simplified anymore
        
                    
             
        
        
        
Well, there are two solutions.
Add both sides by 15.75 then from here, you can use quadratic formula.
So your answer should be x = -2.44949 or 2.44949.
        
             
        
        
        
3x+4y=12
9x-2y=15
 we will use elimination 
multiply 3x+4y=12 by -3
-9x-12y=-36
9x-2y=15
_________ add
-14y=-21
÷-14 both sides 
y=1.5
find x 
3x+4 (1.5)=12
3x+6=12
-6 both sides 
3x=6
÷3 both sides 
x=2
x=2
y=1.5