Question

For simultaneous equations in x and y , if D=28, Dx= -14 , Dy =-21 then what is the value of y ? please answer fast

Answer 1

Answer:

x+y=0..............eqn1×2

10x+15y=105 = 2x+3y=21..........eqn2×1

so after multiplying

-2x+2y=0

2x+3y=21

after adding d two eqn

5y=21

so y=21/5

by putting d value of y in any of the 2 eqn u can also find out x

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