This will be another lesson but for fun here is bullet animation.
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Expression 15: "m" equals StartFraction, "d" Subscript, "y" , Baseline Over "d" Subscript, "x" , Baseline , EndFractionm=dydx
equals=
0.9 7 8 4 7 3 5 8 1 2 1 30.978473581213
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Expression 16: "y" equals "m" left parenthesis, "x" minus "x" Subscript, 2 , Baseline , right parenthesis plus "y" Subscript, 2 , Baseline left brace, "x" less than "x" Subscript, 2 , Baseline , right brace left brace, "x" greater than "x" Subscript, 1 , Baseline , right bracey=mx−x2+y2x<x2x>x1
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Expression 17: "y" equals StartFraction, left parenthesis, "y" Subscript, 2 , Baseline minus 0 , right parenthesis Over left parenthesis, "x" Subscript, 2 , Baseline minus negative 2 , right parenthesis , EndFraction left parenthesis, "x" plus 2 , right parenthesis left brace, "x" less than "x" Subscript, 2 , Baseline , right brace left brace, "x" greater than .5 , right bracey=y2−0x2−−2x+2x<x2x>.5
17
Expression 18: "y" equals StartFraction, left parenthesis, "y" Subscript, 2 , Baseline minus 0 , right parenthesis Over left parenthesis, "x" Subscript, 2 , Baseline minus 1 , right parenthesis , EndFraction left parenthesis, "x" minus 1 , right parenthesis left brace, "y" greater than .4 , right brace left brace, "y" less than 1 , right bracey=y2−0x2−1x−1y>.4y<1