InterviewSolution
Saved Bookmarks
| 1. |
Solve `4x+3y =11 and 3x +4y =10`. |
|
Answer» `4x +3y =11" "`(1) `3x+4y =10" " `(2) Step 1: Adding both the equations, we get `7x+7y = 21` `rArr 7(x+y)= 7xx3` `rArr x +y =3" "` (3) Step 2: Subtracting the equation (2) from the equation (1) `(4x+3y) - (3x+4y)= 11 -10` `rArr x-y =1 " "` (4) Step 3: Adding the equations (3) and (4), we get `(x+y)+ (x-y)= 3+1` `2x =4 rArr x =2` `2+y =3` (from (3)) `y =1` Substituting `y =1` in any of the equations (1), (2), (3) or (4), we get `x =2`. The solution of the pair of equations is `x =2 and y =1`. |
|