Question

hey guys, can anyone plz explain me the Substitution Method for a pair of linear equations in two variables! facing a tough time with this!!! plz!

Answer 1

let's say you got the 2 eq as
x + y = 2 ----- (1)  
x - 2y = 4 -----(2) 

Now our objective is to get a value of x and y such that they satisfy both the equations. 

now coming to the first eq 
x+ y = 2 
x = 2 -y ------ (3) 

now since we want a common x and y value for both equations hence we substitute eq (3) in eq (2) 
x - 2y = 4 =====> 2 - y -2y = 4 {After substitution} 
2 - 3y = 4 ===> 2 - 4 = 3y ===> y = -2/3 

Now substitute the value of y in any eq and get the x value. 
HOPE IT HELPS :)