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Find Cross Multiplication 7y+2x=11,3x-y=5

Solution:
Your problem `->` Cross Multiplication 7y+2x=11,3x-y=5


`7y+2x=11`

`:.2x+7y=11`

and ` 3x-y=5`

`:.3x-y=5`

`2x+7y-11=0 ->(1)`

`3x-y-5=0 ->(2)`

Here,
`a_1=2, b_1=7, c_1=-11`

`a_2=3, b_2=-1, c_2=-5`

`x=(b_1*c_2-b_2*c_1)/(a_1*b_2-a_2*b_1)`

`=((7)(-5)-(-1)(-11))/((2)(-1)-(3)(7))`

`=((-35)-(11))/((-2)-(21))`

`=(-46)/(-23)`

`=2`

`y=(c_1*a_2-c_2*a_1)/(a_1*b_2-a_2*b_1)`

`=((-11)(3)-(-5)(2))/((2)(-1)-(3)(7))`

`=((-33)-(-10))/((-2)-(21))`

`=(-23)/(-23)`

`=1`

`:. x=2" and "y=1`






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