Question

Q.2)What is the value of Dy for the simultaneous equations 3x+2y+11=0 and 7x-4y=9 ? *

Answer 1

Answer:

3x+2y+11=0----------(1)

7x-4y =9

7x-4y-9=0--------------(2)

solution:-

3x+2y+11=0

7x-4y-9=0

__________

2(3x+2y+11)=0

1(7x-4y-9)=0

____________

6x+4y+22=0

7x-4y-9 =0

____________

13x=13

x=13/13=1

Put the value of x in eq(1)

3x+2y+11=0

3×1+2y+11=0

3+2y+11=0

14+2y=0

2y= -14

y= -14/2=-7

x=1 or y= -7