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Find the value of D(x), for solving the ...

Find the value of `D_(x)`, for solving the simultaneous equations `3x+4y=8` , `x-2y=5` by Cramer's rule.

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`{:(3x+4y=8,,,),("Here",a_(1)=3,b_(1)=4, c_(1)=8):}|{:(x-2y=5,,,),("Here",a_(2)=1, b_(2)=-2,c_(2)=5):}`
`D_(x)=|{:(c_(1),b_(1)),(c_(2),b_(2)):}|=|{:(8,4),(5,-2):}|=(8)(-2)-(4)(5)`
`=-16-20=-36`
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