Expression 9: StartFraction, left parenthesis, "h" left parenthesis, "a" , right parenthesis minus 4 , right parenthesis Over left parenthesis, "a" minus 1 , right parenthesis , EndFractionha−4a−1
equals=
negative 0.4 9−0.49
9
This is equation of the secant line. It looks weird, but this is the usual y=mx + b form.
10
Expression 11: "y" equals StartFraction, left parenthesis, "h" left parenthesis, "a" , right parenthesis minus 4 , right parenthesis Over left parenthesis, "a" minus 1 , right parenthesis , EndFraction "x" plus "h" left parenthesis, "a" , right parenthesis minus StartFraction, left parenthesis, "h" left parenthesis, "a" , right parenthesis minus 4 , right parenthesis Over left parenthesis, "a" minus 1 , right parenthesis , EndFraction left parenthesis, "a" , right parenthesisy=ha−4a−1x+ha−ha−4a−1a
11
This is the equation of the tangent line.
12
Expression 13: "y" equals negative 2 "t" plus 6y=−2t+6