Question

378 y
1522 - 378 =-74 And
-378 x + 1524=-604
Find x and y by cross multiplication method​

Answer 1

152x +378y= -74 ..........(1)

-378x + 152y = -604 ............(2)

adding equation (1) and (2) ,we get.

-226x - 226y =-678

-1x - 1y =3 ...........(3)

subtracting (2) from (1) , we get ,

530x -530y =530

1x - 1y = 1 ...........(4)

adding (3) and (4), we get

y= -2

put value of y in equation (4)

1x - 1(-2) = 1

1x + 2= 1

1x = 1 - 2

1x = -1

x = -1 / 1

x = -1

so (-1 ,-2) is the answer of the given simultaneous equation.