Question

3x + 2y + 11 = 0 and 7x -4 y = 9 ?​

Answer 1

Answer:

(-1,-4)

Step-by-step explanation:

1. (3x+2y+11=0)*2 > 6x+4y+22=0
2.                             7x-4y-9=0
3. solving both of them we get 13x+13=0
4. which gives x=-1 and substituting the  value of x in equation in 2nd step or the equation in step-1 we can get the value of y
5. 7(-1)-4y-9=0
6. 4y=-16  which gives y=-4
7. so (x,y)=(-1,-4)

Answer 2

Answer:

$7x - 4y = 9 = > 7x - 4y - 9 = 0 \\ \\ 3x \: \: + \: \: 2y \: \: + \: \: 11 \: \: = \: \: 9 \\ 7x \: \: - \: \: 4y \: \: - \: \: 9 \: \: = \: \: 0 \\ - - - - - - - - - - \\ ( - ) \: \: \: \: \: \: \: ( + ) \: \: \: \: \: \: ( + ) \: \: \: \: \: \: ( - ) \\ - - - - - - - - - - \\ - 4x \: \: + \: 6y \: \: + \: \: 20 \: = \: 9$

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