Question 204055
Remember  that  y=mx+b  is    slope  intercept  form,  and  parallel  lines  have  same  slope
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2x -5y =20
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-5y =20 -2x
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y=(2/5)x -4
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all  parallel  lines  have  same  slope,,(2/5)  just different  y intercepts,,(-4)
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so  a  parallel  line  could  be y=(2/5)x -3,,or  y=(2/5)x -2,,or y=(2/5)x +4
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usually  some  other  limit  would  apply to  define  the  exact  line.
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PLEASE  NOTE
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y=(2/5)x-3 = (5y =2x -15) = (2x -5y = 15),,,which  is  the  same  as  original
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 except  for  the  constant. Therefore, 2x-5y = #,,,is  generalized  answer