Answer:
You'd have to go step by step to get the actual value of y. Then solve the equations by inputting the value for y, therefore eliminating y from both equations
 
        
             
        
        
        
See attached picture for steps and answer:
 
        
        
        
Tangent = opposite/adjacent
tangent = 15 / 8
If opp = 15 and adj = 8 then
hypotenuse^2 = 15^2 + 8^2
hypotenuse^2 = 225 + 64
hypotenuse^2 = 289
hypotenuse = 17
secant = hypotenuse / adjacent
secant = 17 / 8
secant = 2.125
        
             
        
        
        
Solve for m:
8 = m/4
8 = m/4 is equivalent to m/4 = 8:
m/4 = 8
Multiply both sides of m/4 = 8 by 4:
(4 m)/4 = 4×8
(4 m)/4 = 4/4×m = m:
m = 4×8
4×8 = 32:
Answer:  m = 32 thus m - 12 = 32 -12 = 20
        
             
        
        
        
24x6=24-(12x3)-12 divided 4x3is 12
 The awnser:0 
Hope it help