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    <name>
      <text>3.1.1.2.T1 Which equations are linear</text>
    </name>
    <questiontext format="html">
      <text><![CDATA[<p class="HELM_exercise">Exercise</p>

<p>Which of the following are linear equations?</p>

<ol class="HELM_parts">
    <li>{@eq1@} [[input:ans1]] [[validation:ans1]] [[feedback:prt1]]</li>
    <li> {@eq2@} [[input:ans2]] [[validation:ans2]] [[feedback:prt2]]</li>
    <li>{@eq3@} [[input:ans3]] [[validation:ans3]] [[feedback:prt3]]</li>
    <li> {@eq4@} [[input:ans4]] [[validation:ans4]] [[feedback:prt4]]</li>
</ol>]]></text>
    </questiontext>
    <generalfeedback format="html">
      <text><![CDATA[<ol class="HELM_parts">
    <li>{@eq1@} is a linaer equation in \(x.\)</li>
    <li> {@eq2@} is a linear equation in \(t.\)</li>
    <li>{@eq3@} is not a linear equation. There is a quadratic term {@a1*x^2@}.</li>
    <li> {@eq4@} is a linear equation in \(p\) where the constant term is zero. </li>
</ol>]]></text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
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    <idnumber/>
    <stackversion>
      <text>2021120900</text>
    </stackversion>
    <questionvariables>
      <text>a1: rand(5)+2;
a2: rand_with_prohib(3,8,[a1]);
b1: rand(5)+6;
b2: rand(8)+10;

eq1: a1*x+b1=0;
ta1: true;

eq2: -a2*t+b2=0;
ta2: true;

eq3: a1*x^2+b1=0;
ta3: false;

eq4: a2*p=0;
ta4: true;</text>
    </questionvariables>
    <specificfeedback format="html">
      <text/>
    </specificfeedback>
    <questionnote format="moodle_auto_format">
      <text>\[ {@eq1@}, \quad {@eq2@}\]
\[{@eq3@}, \quad {@eq4@} \]</text>
    </questionnote>
    <questiondescription format="moodle_auto_format">
      <text/>
    </questiondescription>
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      <text><![CDATA[<span style="font-size: 1.5em; color:green;"><i class="fa fa-check"></i></span> Correct answer, well done.]]></text>
    </prtcorrect>
    <prtpartiallycorrect format="html">
      <text><![CDATA[<span style="font-size: 1.5em; color:orange;"><i class="fa fa-adjust"></i></span> Your answer is partially correct.]]></text>
    </prtpartiallycorrect>
    <prtincorrect format="html">
      <text><![CDATA[<span style="font-size: 1.5em; color:red;"><i class="fa fa-times"></i></span> Incorrect answer.]]></text>
    </prtincorrect>
    <decimals>.</decimals>
    <scientificnotation>*10</scientificnotation>
    <multiplicationsign>none</multiplicationsign>
    <sqrtsign>1</sqrtsign>
    <complexno>i</complexno>
    <inversetrig>cos-1</inversetrig>
    <logicsymbol>lang</logicsymbol>
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</quiz>
