Answer:
slope = -6 and y intercept=0
Step-by-step explanation:
 
        
             
        
        
        
The two linear equations in two variable is:
12 x + 3 y = 40
7 x - 4 y = 38
(a) For a system of equations in two Variable 
a x + by = c
p x + q y = r
It will have unique solution , when

As, you can see  that in the two equation Provided above 
 
So, we can say the system of equation given here has unique solution.
(b). If point (2.5, -3.4) satisfies both the equations, then it will be solution of the system of equation, otherwise not. 
1. 12 x+3 y=40
2. 7 x-4 y=38
Substituting , x= 2.5 , and y= -3.4 in equation (1) and (2),
L.H.S of Equation (1)= 1 2 × 2.5 + 3 × (-3.4)
                              = 30 -10.20
                                = 19.80≠ R.H.S that is 40.
Similarly, L H S of equation (2)= 7 × (2.5) - 4 × (-3.4)
                                                   = 17.5 +13.6
                                                   = 31.1≠R HS that is 38
So, you can Write with 100 % confidence that point (2.5, -3.4) is not a solution of  this system of the equation. 
 
        
             
        
        
        
What’s the question tho lol