ImplicitPlane1
Answer is an Equation for a Line or Plane
This PG code shows how to define an answer that is a line or plane.
 File location in OPL: FortLewis/Authoring/Templates/DiffCalcMV/ImplicitPlane1.pg
 PGML location in OPL: FortLewis/Authoring/Templates/DiffCalcMV/ImplicitPlane1_PGML.pg
PG problem file  Explanation 

Problem tagging: 

DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "parserImplicitPlane.pl", "parserVectorUtils.pl", "AnswerFormatHelp.pl", ); TEXT(beginproblem()); 
Initialization: 
Context("ImplicitPlane"); $A = non_zero_point3D(5,5,1); $N = non_zero_vector3D(5,5,1); $answer1 = ImplicitPlane($A,$N); Context()>variables>are(x=>"Real",y=>"Real"); $answer2 = ImplicitPlane("4x+3y=12"); $answer3 = ImplicitPlane("x=3"); 
Setup:
The first answer is a standard mulitivariable calculus question. There are several different ways to specify the input to
When the 
Context()>texStrings; BEGIN_TEXT (a) Enter an equation for the plane through the point \( $A \) and perpendicular to \( $N \). $BR \{ ans_rule(20) \} \{ AnswerFormatHelp("equations") \} $BR $BR (b) Enter an equation for the line in the xyplane with xintercept \( 3 \) and yintercept \( 4 \). $BR \{ ans_rule(20) \} \{ AnswerFormatHelp("equations") \} $BR $BR (c) Enter an equation for the vertical line in the xyplane through the point \( (3,1) \). $BR \{ ans_rule(20) \} \{ AnswerFormatHelp("equations") \} END_TEXT Context()>normalStrings; 
Main Text: 
$showPartialCorrectAnswers = 1; ANS( $answer1>cmp() ); ANS( $answer2>cmp() ); ANS( $answer3>cmp() ); 
Answer Evaluation: 
Context()>texStrings; BEGIN_SOLUTION Solution explanation goes here. END_SOLUTION Context()>normalStrings; COMMENT('MathObject version.'); ENDDOCUMENT(); 
Solution: 