Question

X+y=9 and 7x+15y=9 x Ka man​

Answer 1

Answer:

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Step-by-step explanation:

Answer:

Step-by-step explanation:

3x+6y=9-------eq 1

7x-15y=2--------eq 2

x=(2+15y)/7------eq 3

Putting value of X in eq 1,

3{(2+15y)/7}+6y=9

6+45y+42y=63

y= 57/87

y= 19/29

Putting value of Y in eq 3

x=2+15*19/29/7

x=2+285/29/7

x=58+285/29*7

x=343/203

x= 49/29

Answer 2

Step-by-step explanation:

x + y = 9-(i)equation ×7

7x + 7y = 9 -(ii)equation ×1

7x + 7y = 63-(iii)equation

7x + 15y = 9-(iv)equation

using elimination method in (iii)&(iv)equation

7x + 7y = 63

-7x +- 15y =- 9

-7y = 54

y = -54/7

put y=-54/7 in (i) equation

x + y = 9

x + (-54/7) = 9

x - 54/7 = 9

(7x-54)/7 = 9

7x - 54 = 63

7x = 63 - 54

x = 9/7