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{SECT 0 {PARA 3 "" 0 "" {TEXT -1 12 "Substitution" }{TEXT -1 0 "" }}
{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 85 "You will \+
occasionally want to substitute a value or expression for a variable i
n some" }}{PARA 0 "" 0 "" {TEXT -1 65 "expression, equation, or functi
on.  You do this with the command " }{TEXT 256 5 "subs." }{TEXT -1 15 
"  The syntax is" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 15 "subs(x=a
,expr);" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 
27 "For example, to substitute " }{XPPEDIT 18 0 "x = 23;" "6#/%\"xG\"#
B" }{TEXT -1 6 " into " }{XPPEDIT 18 0 "x^3+2*x^2-6*x+9;" "6#,**$)%\"x
G\"\"$\"\"\"F(*&\"\"#F(*$)F&\"\"#F(F(F(*&\"\"'F(F&F(!\"\"\"\"*F(" }
{TEXT -1 19 ", give the command " }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 
1 0 28 "subs(x=23, x^3+2*x^2-6*x+9);" }}}{PARA 0 "" 0 "" {TEXT -1 79 "
You can substitute for more than one variable.  For example, for two v
ariables," }}{PARA 0 "" 0 "" {TEXT -1 14 "the syntax is " }}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 21 "subs(\{x=a,y=b\},expr);" }}}{PARA 
0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 27 "For example, to
 substitute " }{XPPEDIT 18 0 "x = 23;" "6#/%\"xG\"#B" }{TEXT -1 2 ", \+
" }{XPPEDIT 18 0 "y = -39;" "6#/%\"yG,$\"#R!\"\"" }{TEXT -1 6 " into \+
" }{XPPEDIT 18 0 "x^3*y^7;" "6#*&)%\"xG\"\"$\"\"\")%\"yG\"\"(F'" }
{TEXT -1 0 "" }{TEXT -1 18 ", give the command" }}{PARA 0 "" 0 "" 
{TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 27 "subs(\{x=23,
y=-39\},x^3*y^7);" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" 
{TEXT -1 18 "If you substitute " }{TEXT -1 4 "for " }{XPPEDIT 18 0 "x;
" "6#%\"xG" }{TEXT -1 55 " and not y in this example, you will get a f
unction of " }{XPPEDIT 18 0 "y;" "6#%\"yG" }{TEXT -1 1 "." }}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 19 "subs(x=23,x^3*y^7);" }}}{PARA 0 "" 
0 "" {TEXT -1 49 "You can also substitute into several expressions." }
{TEXT -1 48 "  The syntax if there is one variable and there " }}
{PARA 0 "" 0 "" {TEXT -1 22 "are two expressions is" }{TEXT -1 0 "" }}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 24 "subs(x=a,\{expr1,expr2\});" 
}}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 33 "subs(x=23,\{x^3+2*x^2-6*x
+9,2^x\});" }}}{PARA 0 "" 0 "" {TEXT -1 69 "The result is a pair of va
lues if you substituted in two expressions." }}{EXCHG {PARA 0 "> " 0 "
" {MPLTEXT 1 0 0 "" }}}}{MARK "24" 0 }{VIEWOPTS 1 1 0 1 1 1803 }