Question

To solve 5x-6y+30=0 and 5x+4y-20=0 by determinant method ,the value of D is _______​

Answer 1

Answer:

5x -6y = -30

(-)5x +4y = 20

__________

-10y = -50

y = 5

so substitute value of y in any equation given

5x + 20 -20 = 0

5x = 0

x = 0

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Answer 2

Step-by-step explanation:

Complete the following activity to solve the simultaneous equations. 5x + 3y = 9 ... Putting the value of x = 3 in (I) we get ... Find the values of following determinants. ... (3) 5x – 6y + 30 = 0 ; 5x + 4y – 20 = 0