if a line is passing through the origin thn how to shade d region in liner inequality..??lik if the eq is y-4x= 0

For this type of question , take any point in the quadrant which don't lie in the given line . say  (1,0)  . Now if this point is satisfying the inequality shade the portion where (1,0 ) is lying , if not shade the opposite side . 
Hope this would have cleared your doubt.

  • 40

you'll get unbounded region , shading depends upon sign of inequality

  • -12

y-4x is less than equal to 0 ??

  • -3

if y - 4x 0 , shade left side of the line

  • 3
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