// Numbas version: finer_feedback_settings {"name": "Simultaneous equations: simple quadratic and hyperbola, one point", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "Simultaneous equations: simple quadratic and hyperbola, one point", "tags": ["algebra", "Algebra", "equations", "hyperbola", "quadratic", "Simultaneous equations", "simultaneous equations", "solving equations", "Solving equations", "system of equations"], "metadata": {"description": "", "licence": "Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International"}, "statement": "", "advice": "", "rulesets": {}, "extensions": [], "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true, "j": false}, "constants": [], "variables": {"a": {"name": "a", "group": "Ungrouped variables", "definition": "random(-4..4 except 0)", "description": "", "templateType": "anything", "can_override": false}, "b": {"name": "b", "group": "Ungrouped variables", "definition": "if(abs(xans)=10, random(-10..10 except [a,0,1,-1,7,-7]),random(-12..12 except [a,0,1,-1]))", "description": "", "templateType": "anything", "can_override": false}, "xans": {"name": "xans", "group": "Ungrouped variables", "definition": "random(-12..12 except [0,1] )", "description": "", "templateType": "anything", "can_override": false}, "ak": {"name": "ak", "group": "Ungrouped variables", "definition": "a*cubed", "description": "", "templateType": "anything", "can_override": false}, "cubed": {"name": "cubed", "group": "Ungrouped variables", "definition": "xans^3", "description": "", "templateType": "anything", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": "1000"}, "ungrouped_variables": ["xans", "cubed", "a", "ak", "b"], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "gapfill", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "
Find the $x$ and $y$ values that satisfy both of the following equations. That is, find the point of intersection of the two curves.
\n$y$ | \n$=$ | \n$\\simplify{{ak}/({b}x)}$ | \n$(1)$ | \n
$y$ | \n$=$ | \n$\\simplify{{a}x^2/{b}}$ | \n$(2)$ | \n
$x=$ [[0]], $y=$ [[1]]
\n", "stepsPenalty": "2", "steps": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "Given
\n$y$ | \n$=$ | \n$\\simplify{{ak}/({b}x)}$ | \n$(1)$ | \n
$y$ | \n$=$ | \n$\\simplify{{a}x^2/{b}}$ | \n$(2)$ | \n
substitute the expression for $y$ given in $(1)$ into $(2)$:
\\[\\simplify{{ak}/({b}x) ={a}x^2/{b}}\\]
To get rid of the $x$ in the denominator, let us multiply both sides by $x$
\\[\\simplify{{ak}/({b}) ={a}x^3/{b}}\\]
Since there is only one term with an $x$ in it, we can get $x^3$ by itself
\n\\[x^3=\\var{cubed}\\]
\nTherefore, $x=\\sqrt[3]{\\var{cubed}}=\\var{xans}$.
\n
Now we know the $x$ value we can determine the corresponding $y$ value by substituting $x=\\var{xans}$ into either equation $(1)$ or $(2)$, below we substitute into $(2)$:
\n $y$ \n | \n\n $=$ \n | \n\n $\\simplify{{a}/{b}}(\\var{xans})^2$ \n | \n
\n | \n $=$ \n | \n\n $\\simplify[fractionnumbers]{{a*xans^2/b}}$ \n | \n
Therefore the values that satisfy equations $(1)$ and $(2)$ are $x=\\var{xans}$ and $y=\\simplify[fractionnumbers]{{a*xans^2/b}}$.
\n"}], "gaps": [{"type": "numberentry", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "minValue": "xans", "maxValue": "xans", "correctAnswerFraction": false, "allowFractions": true, "mustBeReduced": false, "mustBeReducedPC": 0, "displayAnswer": "", "showFractionHint": false, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "minValue": "a*xans*xans/b", "maxValue": "a*xans*xans/b", "correctAnswerFraction": true, "allowFractions": true, "mustBeReduced": false, "mustBeReducedPC": 0, "displayAnswer": "", "showFractionHint": false, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}], "sortAnswers": false}], "partsMode": "all", "maxMarks": 0, "objectives": [], "penalties": [], "objectiveVisibility": "always", "penaltyVisibility": "always", "contributors": [{"name": "Ben Brawn", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/605/"}]}]}], "contributors": [{"name": "Ben Brawn", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/605/"}]}