On what do u Need help on?
        
             
        
        
        
Answer:
option b
Step-by-step explanation:
replace x and y with the x and y of the ordered pair 
option a: 2(4)+4(5)=6(4)-5
solve
8+20=24-5
28=19  not true
option b:2(5)+4(4)=6(5)-4
solve
10+16=30-4
26=26  true 
 
        
             
        
        
        
There is one solution:
use elimination method
5x - 7y = 12
5y - 2x = -7    ---> change equation around
 5x - 7y = 12
-2x + 5y = -7
2 x ( 5x - 7y) = 2 x (12)    multiply both sides by 2
5 x (-2x +5y) = 5 x (-7)
this give you
 10x - 14y =24 
-10x+25y = -35                    add down
-----------------------------
        11y = - 11                    x is eliminated to find y value
           
            y = -1                         input to one of the original equations
5(-1)  - 2x = -7
-5  - 2x = -7
+5           +5                       add 5 to both sides
----------------------------
-2x = -2
    x = 1
your coordinates for when they intersect is at (1, -1)
one solution