Make a table of values from -10 to +10 for x,
and solve for y.  I'll do one of them for you, say when x=-7








  x | y
-10 | 5
 -9 | 4.05
 -8 | 3.2
 -7 | 2.45
 -6 | 1.8
 -5 | 1.25
 -4 | 0.8
 -3 | 0.45
 -2 | 0.2
 -1 | 0.05
  0 | 0
  1 | 0.05
  2 | 0.2
  3 | 0.45
  4 | 0.8
  5 | 1.25
  6 | 1.8
  7 | 2.45
  8 | 3.2
  9 | 4.05
 10 | 5 

Then plot them:



Then connect them with a smooth curve:



Edwin