The given expression can be simplified to: 7x+4y
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x+7x+3y-y =8x+2y =2(4x+y)
y=mx+b 7x+3y=21 3y=21-7x *****_ y=7-2.3x *****_ m= -2.3 negative
4xy+1=3y-7x 4xy-3y=-7x-1 y(4x-3)=-7x-1 y=(-7x-1)/(4x-3)
7x+3y=-52 3(8x-y=-74) 7x+3y=-52 24x-3y=-222 7x=-52 + 24x=-222 31x=-274 x=8.8387
It's an expression in 'x' and 'y'.It may be simplified (cleaned up) to yield:7x + 2y - 2x + 3y =5x +5yor5 (x + y)