checkfile=exos/checkfile8.proc
!set n=$counter
image=0
!if $level =0
    R=$counter
!else
    R=$level
!endif        

!if $variabelen=1
    letters=a,b,c,d,f,x,y,z,p,g,k,t,r,n,m
    letters=!shuffle $letters 
    var1=!item 1 of $letters
    var2=!item 2 of $letters
    var3=!item 3 of $letters
    var4=!item 4 of $letters
!else
    var1=x
    var2=y
    var3=u
    var4=v
!endif   
getallen=!shuffle 2,3,4,5,6,7,8,9,10
a=!item 1 of $getallen
b=!item 2 of $getallen
c=!item 3 of $getallen
d=!item 4 of $getallen
e=!item 5 of $getallen
f=!item 6 of $getallen
g=!item 7 of $getallen
h=!item 8 of $getallen     	
pm=!randitem +,-
mp=!randitem +,-
mm=!randitem +,-
    
#exotitle=Schrijf het volgende stelsel van drie vergelijking op als &eacute;&eacute;n vergelijking 
#question$n=Schrijf de drie vergelijkingen als &eacute;&eacute;n formule <br><em>Dus geef <tt>$var2</tt> als functie van <tt>$var1</tt></em> .
    
exotext=!record 25 of lang/remarks.$taal
#@ Schrijf drie vergelijkingen als &eacute;&eacute;n (H4 Wiskunde A1)
question$n=!record 67 of lang/remarks.$taal
#@ Schrijf de drie vergelijkingen als &eacute;&eacute;n formule <br><em>Dus geef <tt>$var2</tt> als functie van <tt>$var1</tt></em> 
!if $R=1
    # k=x mm d
    # z=k pm b
    # y=z mp  c
    # texanswer$n= y= ((x mm d) pm b) mp c 
    g=!exec pari A= (($var1 $mm $d) $pm $b) $mp $c
    printtex(A)
    g1=!line 1 of $g
    g2=!line 2 of $g
    texanswer$n=$var2 \,=\, $g2
    answer$n=$g1
    formula$n=\left\{ \begin{array}{l}$var4=$var1 $mm $d \\ $var3 = $var4 $pm $b \\ $var2 = $var3 $mp $c \end{array}\right.
 !exit
!endif
	
!if $R=2
    # k=x mm d
    # z=ak
    # y=dz mp  c
    # texanswer$n= y= d( a*(x mm d)) pm c 
    g=!exec pari A=$d*($a*($var1 $mm $d)) $mp $c\
    printtex(A)
    g1=!line 1 of $g
    g2=!line 2 of $g    
    texanswer$n=$var2 \,=\, $g2
    answer$n=$g1
    formula$n=\left\{ \begin{array}{l}$var4=$var1 $mm $d \\  $var3 = $a \cdot $var4 \\ $var2 = $d \cdot $var3 $mp $c \end{array}\right.
 !exit
!endif
	
!if $R=3
    # k=x mm e
    # z=ak pm b
    # y=dz mp  c
    # texanswer$n= y= d*(a*(x mm e) pm b ) mp c 
    g=!exec pari A=$d*($a*($var1 $mm $e) $pm $b) $mp $c\
    printtex(A)
    g1=!line 1 of $g
    g2=!line 2 of $g
    texanswer$n=$var2 \,=\, $g2
    answer$n=$g1
    formula$n=\left\{ \begin{array}{l} $var4 = $var1 $mm $e \\ $var3 = $a \cdot $var4 $pm $b \\  $var2 = $d \cdot $var3 $mp $c \end{array}\right.
  !exit
!endif
!if $R>3
    mytexsize=+2
    keuze=!randitem 1,2
    !if $keuze=1
	# k=x mm e	
	# z=k/a pm b
	# y=dz mp  c
        # texanswer$n= y=d((x mm e)/a $pm b) mp c 
        g=!exec pari A=$d*(($var1 $mm $e)/$a $pm $b) $mp $c\
        printtex(A)
        g1=!line 1 of $g
        g2=!line 2 of $g
        texanswer$n=$var2 \,=\, $g2
        answer$n=$g1
        formula$n=\left\{ \begin{array}{l}$var4 = $var1 $mm $e \\  $var3 = \frac{1}{$a} \cdot $var4 $pm $b \\ $var2 = $d \cdot $var3 $mp $c \end{array}\right.
     !exit
    !else
	# k=x mm f
	# z=e*k/a pm b
	# y=dz mp  c
	# texanswer$n= y= d(e*(x mm f)/a pm b) mp c
	g=!exec pari A=$d*($e*($var1 $mm $f)/$a $pm $b) $mp $c\
	printtex(A)
	g1=!line 1 of $g
	g2=!line 2 of $g
	texanswer$n=$var2 \,=\, $g2
	answer$n=$g1
	formula$n=\left\{ \begin{array}{l}$var4= $var1 $mm $f \\  $var3 = \frac{$e}{$a} \cdot $var4 $pm $b  \\ $var2 = $d \cdot $var3 $mp $c \end{array}\right.
     !exit
    !endif	
!endif
