Answer:
Step-by-step explanation:
hello : 
the system is :  x+ y =4 ...(*) 
                        2x - y = -1...(**)
add(*) and (**) : 3x=3    so : x=1
put this value into (*) : 1+y=4     so : y=3
one solution : (1 , 3)
 
        
             
        
        
        
Question:
Fill in the blank.
23 x 6 = (20 + 3) * 6
23 x 6 = _ + (3x6)
Options
20 * 6
20 * 3
20 * 5
Answer:
20 * 6
Step-by-step explanation:
Given
Expression 1:  23 * 6 = (20 + 3) * 6
Expression 2:  23 * 6 = __ + (3 * 6)
Required
Fill in the blank
From Expression 1
23 * 6 = (20 + 3)*6
Using Distributive Property; The expression becomes
23 * 6 = 20 * 6 + 3 * 6
23 * 6 = (20 * 6) + (3 * 6)
By Comparing this with expression 2
23 * 6 = __ + (3 * 6)
The blank position is occupied by 20 * 6.
Hence, the correct option that fills the missing blank correctly is 20 * 6
 
        
             
        
        
        
Answer:
40 cm.
Step-by-step explanation:
Given,
height of the object = 10 cm
Distance of the object from the X-ray= 50 cm
Distance of detector from the source = 2 m = 200 cm
Height of the image, h = ?
Now,



Again applying 


h = 40 cm
Hence, height of the image is equal to 40 cm.