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Question

On the coordinates plane XOY hatch a set of points whose coordinates satisfy the following inequalities in two variables x and y (show the boundary belonging to the set by a solid line and that not belonging to the set by a dash line).
|x|+|y|<4,log2(2yx2+4)>log2(y+1)

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Solution

R.E.F image
|x|+|y|<4 log2(2yx2+4)>log2(y+1)
case 1, x>0,y>0 base of log is >1
x+y<4 2yx2+4>y+1
case - 2 y>x23
x>0,y<0
xy<4
case - 3
x<0,y>0
xy<4
case - 4
x<0,y<0
x+y>4
Comparing both

1127201_886398_ans_3c0be6bc83b040538875ae9f733054b1.jpg

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