Question

x minus 3y = 10 and x minus 7y = minus 30 by elimination method .​

Answer 1

Answer:

x - 3y = 10 ------- (i)

x - 7y = 30 -------(ii)

Using elimination method.

We subtract eq. (ii) and (i)

        x   -  7y =   30

        x   -  3y =   10

       (-)   (+)       (-)

--------------------------------

    0      - 4y  =  20

           y = -5

     putting the value of y in eq. (i)

      x - 3 y  =  10

      x - 3 (-5)  =  10

      x + 15 = 10

     x  =   -5