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
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        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
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-2x = -2
    x = 1
your coordinates for when they intersect is at (1, -1)
one solution
        
                    
             
        
        
        
 Multiply 140 on both sides to get "x" by itself
    Multiply 140 on both sides to get "x" by itself


8 = x
 
        
             
        
        
        
Answer:
The answer is 25
Step-by-step explanation:
6•5=30
30+20=50
50/-2=25
 
        
             
        
        
        
<span>     
11 1/7 mixed number
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Answer:
Step-by-step explanation:
number of members=22
mean age=19 years
Total age of 22 members=22×19=418 years
age of new members=17 years and 30 years
Total age of 24 members=418+17+30=465 years
mean=465÷24=19.375 years