Question

solve the following by cross multiplication method :9/x-4/y=8;13/x+7/y=101​

Answer 1

Answer:

9x−4y=8 -------- (i)

13x+7y=101 --------(ii)

Multiplying equation (i) by 7 and (ii) by 4 and subtracting we get,

63x−28y=56 --------(iii)

52x−28y=404 --------(iv)

115x=460

x=

115

460

x=4

Putting the value of x in (i) we get,

9(4)−4y=8

→36−4y=8

→−4y=8−36

→−4y=−28

→y=

4

28

→y=7

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