t$,$x$=$var$(\text{'}$t$,$x$\text{'})$ #declaring variables

f$($t$,$x$)=($x$+$t$)/($x$^2+$t$^2)$

p$1=$plot$\_$slope$\_$field$($f$,($t$,-1,5),($x$,-5,10),$ headaxislength$=3,$ headlength$=3,$ axes$\_$labels$=[\text{'}$$t$$\text{'},\text{'}$$x$($t$)$$$\text{'}],$fontsize$=12)$

p$2=$desolve$\_$rk$4($f$,$x$,$ics$=[0,1],$ivart$=$t$,$output$=$'plot',end$\_$points$=[-1,5],$thickness$=2)$

p$3=$desolve$\_$rk$4($f$,$x$,$ics$=[0,3],$ivart$=$t$,$output$=$'plot',end$\_$points$=[-1,5],$thickness$=2,$ color$=$'red'$)$

$($p$1+$p$2+$p$3).$show$($xmin$=-1,$xmax$=5,$ymin$=-5,$ymax$=10)$ This is my code I don't know where I went wrong for part A $.$ QUESTION Plotting Direction Fields: Plot the direction field and the solution curve$($s$)$ for each of the

following initial conditions in a single axes using SAGE.

$($a$)\frac{dx}{dt}=\frac{x+t}{x^2+t^2},x(0)=1,x(0)=3$

$($b$)\frac{dy}{dt}=2y(1-\frac{y}{4}),y(0)=1,y(0)=4$