Question

What is the value of Dx for the simultaneous equations 3x + 2y + 11 = 0 and 7x - 4y = 9 ?

Answer 1

Answer:

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

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

Now taking equation (2)

7x-4y-9=0-------------(3)

Now,

multiplying equation (1) by 2

6x+4y+22=0--------------(4)

Now,

Add equation (3) and (4)

7x- 4y- 09 = 0

6x+4y+22 = 0

____________

13x + 13 = 0

13x = - 13

x = - 13/13

x = -1

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