Author an equation sub-type
This sub-type is authored by selecting the Equation option from the Sub-type drop-down list during mathematical formula question authoring.
Examples of accepted syntax for defining the Answer field value for this sub-type are:
- x = 1 - 2y
- y = 4*(x+1) +2
- y = 8*(x-2) + 7
The equation sub-type Answer field:
- Accepts the use of an "=" sign in the correct answer.
- Accepts any equation that's algebraically equivalent to the correct answer as an equivalent response.
- Requires the correct answer expression to have only a single variable on the left-hand side of the equation and a formula that doesn't involve that variable on the right-hand side (an implicit formula can't be specified).
NOTE: Students don't need to isolate a variable of the equation like question authors do. Students can enter any equivalent form of the correct answer. Example — if the equation sub-type question has y = 4*(x+1)+ 2 in the Answer field, a student could respond with y-2 = 4*(x+1) and be graded correctly.
NOTE: This question sub-type allows the student to choose whether they want to submit their response using Symbol Mode (using the Equation Editor) or Text Mode (as a single line using their keyboard).
NOTE: The equation question is one of the ten sub-types of the mathematical formula question. Check out Choose a mathematical formula question sub-type for an explanation of each of the ten available mathematical formula question sub-types.
TIP: Check out Author a mathematical formula question for full question authoring instructions.
Example of this sub-type
- Question statement:
What is the equation of the straight line passing through the point (2, 7) with slope 8?
- Answer field syntax:
y = 8*(x-2) + 7
Example of this sub-type with an algorithm
- Question statement:
What is the equation of the straight line passing through the point ($xone, $yone) with a slope $m?
- Algorithm:
$xone = rint(-10,10);
$yone = decimal(1, rand(-10,10));
$m = rint(2, 10);
- Answer field syntax:
y = $m*(x-$xone) + $yone
NOTE: The dollar sign ($) character can only be used in mathematical formula questions when it's a part of a variable name. Be sure to define algorithmic variables in the Algorithm pane in order to use them in the Answer field.
