Question

....For simultaneous equations in x and y, if D = 30 , Dx = -18 , Dy = -12, then what is the value of y ?


-3/5


3/5


-2/5


2/5​

Answer 1

Answer:

y = Dy/D

= -12/30

= -2/5

this method of solution is called cross multiplication method

Answer 2

Answer:dx=-18

(30)x=-18

x=-18/30

x=-3/5

dy=-12

(30)y=-12

y=-12/30

y=-2/5

Therefore x=-3/5

y=-2/5

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