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ABCD is a cyclic quadrilateral such t...

ABCD is a cyclic quadrilateral such that ∠A=( 4y+20 )°,  ∠B=( 3y−5 )°,  ∠C=( −4x)° and ∠D=( -7x+5 )° . Find the four angles.

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Sum of opposite angles`=180@`
`angle A + angle C=180^@`
`(4y+20)^@+(-4x)^@=180^@`
`-4x+4y=160^@`
`-x+y=40^@`
`-x=40-y`
`angle B + angle D= 180^@`
`(3y-50)^@+(-7x+5)^@=180^@`
...
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