Try to answer the following questions here:

• What is this question used for?
• What does this question assess?
• What does the student have to do?
• How is the question randomised?
• Are there any implementation details that editors should be aware of?

### History

#### Checkpoint description

Describe what's changed since the last checkpoint.

#### Patricio Ramirez2 years, 6 months ago

Created this as a copy of Ecuación de cuarto grado reducible a Cuadrática .
Simultaneous linear equations (variables) Ready to use Bill Foster 01/06/2016 09:47
Jack's copy of Simultaneous linear equations (variables) draft Jack Aiston 02/09/2013 11:42
(worksheet) Simultaneous linear equations (variables) draft Peter Rowlett 12/02/2014 11:20
Lois's copy of Simultaneous linear equations (variables) draft Lois Rollings 11/07/2014 15:17
Jessica's copy of Simultaneous linear equations (variables) Ready to use Jessica Ryan 01/06/2016 09:47
Lois's copy of Simultaneous linear equations (variables) Ready to use Lois Rollings 20/09/2016 12:50
José's copy of Lois's copy of Simultaneous linear equations (variables) Ready to use José Klenner 01/06/2016 09:47
Systems of linear equations in 2 variables draft Vicky Hall 06/02/2018 16:00
Simultaneous linear equations (variables) draft steve kilgallon 05/09/2016 11:50
John's copy of Simultaneous linear equations (variables) draft John Bridges 05/09/2016 13:02
Simultaneous linear equations 1 2x2 system draft Clare Lundon 13/10/2016 10:15
Mock exam Simultaneous linear equations (variables) draft steve kilgallon 27/10/2016 19:36
Simultaneous equations (2) draft Hannah Bartholomew 15/09/2017 15:26
FY001 mock 2 Simultaneous linear equations (variables) draft steve kilgallon 03/12/2016 13:44
FY001_exam_2 Simultaneous linear equations (variables) draft steve kilgallon 03/12/2016 13:41
Denis's copy of Simultaneous equations (2) draft Denis Flynn 26/01/2017 12:02
Gareth's copy of Denis's copy of Simultaneous equations (2) draft Gareth Woods 16/03/2017 12:54
Simultaneous Equations draft Gareth Woods 04/07/2018 11:13
Gareth's copy of Gareth's copy of Gareth's copy of Denis's copy of Simultaneous equations (2) draft Gareth Woods 16/03/2017 12:54
Ian's copy of Simultaneous linear equations (variables) draft Ian Loasby 21/07/2017 13:14
Simultaneous equations (2) draft steve kilgallon 25/10/2017 17:24
Ioannis's copy of Lois's copy of Simultaneous linear equations (variables) Needs to be tested Ioannis Lignos 28/10/2018 19:30
Sistema de Ecuaciones (2x2) (2) draft Patricio Ramirez 14/01/2018 05:55
Sistema de Ecuaciones no Lineal (3) draft Patricio Ramirez 14/01/2018 06:05
Sistema de Ecuaciones no Lineal (4) draft Patricio Ramirez 14/01/2018 06:09
Sistema de Ecuaciones (2x2) (1) draft Patricio Ramirez 14/01/2018 05:54
Ecuación de cuarto grado reducible a Cuadrática draft Patricio Ramirez 15/01/2018 06:44
Razones draft Patricio Ramirez 15/01/2018 06:00
proporcionalidad Inversa draft Patricio Ramirez 15/01/2018 06:54
proporcionalidad directa draft Patricio Ramirez 15/01/2018 05:51
Ecuación de cuarto grado reducible a Cuadrática.jk draft José Klenner 15/01/2018 14:51
Sistema de Ecuaciones no Lineal (4).jk draft José Klenner 15/01/2018 15:11
Sistema de Ecuaciones (2x2) (1).jk draft José Klenner 15/01/2018 15:12
Sistema de Ecuaciones no Lineal (3).jk draft José Klenner 15/01/2018 15:14
Sistema de Ecuaciones (2x2) (2).jk draft José Klenner 15/01/2018 15:16
Anne's copy of Sistema de Ecuaciones (2x2) (1).jk draft Anne Hurley 16/01/2018 14:00
Diagnostic Test - Simultaneous Equations draft Gareth Woods 04/07/2018 15:26
Simon's copy of Simultaneous linear equations (variables) draft Simon Thomas 21/03/2019 15:26
Third Form 2018 Question 15 (Essay) Ready to use sean hunte 08/05/2019 02:44
linear equations in 2 variables draft Thomas Waters 11/09/2019 21:43
Linear equations in 2 variables draft Thomas Waters 11/09/2019 22:26
Simultaneous equations (2) draft Sid Gurjar 06/04/2020 05:32
Sistemi di equazioni lineari in due variabili Ready to use Irene Paniccia 21/05/2020 08:18
Systems of linear equations in 2 variables Ready to use John Ian Keng 01/07/2020 15:22

Give any introductory information the student needs.

No variables have been defined in this question.

(a number)

Numbers between and (inclusive) with step size
A random number between and (inclusive) with step size

(text string)

(numbers)

(text strings)

This variable is an HTML node. HTML nodes can not be relied upon to work correctly when resuming a session - for example, attached event callbacks will be lost, and mathematical notation will likely also break.

If this causes problems, try to create HTML nodes where you use them in content areas, instead of storing them in variables.

Describe what this variable represents, and list any assumptions made about its value.

This variable doesn't seem to be used anywhere.

Name Type Generated Value

#### Error in variable testing condition

There's an error in the condition you specified in the Variable testing tab. Variable values can't be generated until it's fixed.

Error:

for seconds

Running for ...

Name Limit

### Penalties

Name Limit

No parts have been defined in this question.

Select a part to edit.

The correct answer is an equation. Use the accuracy tab to generate variable values satisfying this equation so it can be marked accurately.

#### Checking accuracy

Define the range of points over which the student's answer will be compared with the correct answer, and the method used to compare them.

#### Variable value generators

Give expressions which produce values for each of the variables in the expected answer. Leave blank to pick a random value from the range defined above, following the inferred type of the variable.

#### String restrictions

Both choices and answers must be defined for this part.

Help with this part type

#### Test that the marking algorithm works

Check that the marking algorithm works with different sets of variables and student answers using the interface below.

Create unit tests to save expected results and to document how the algorithm should work.

There's an error which means the marking algorithm can't run:

Name Value

Alternative used:

Note
Value Feedback

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#### Unit tests

No unit tests have been defined. Enter an answer above, select one or more notes, and click the "Create a unit test" button.

The following tests check that the question is behaving as desired.

### This test has not been run yet This test produces the expected output This test does not produce the expected output

This test is not currently producing the expected result. Fix the marking algorithm to produce the expected results detailed below or, if this test is out of date, update the test to accept the current values.

One or more notes in this test are no longer defined. If these notes are no longer needed, you should delete this test.

Name Value

 This note produces the expected output

This test has not yet been run.

When you need to change the way this part works beyond the available options, you can write JavaScript code to be executed at the times described below.

Run this script the built-in script.

This script runs after the built-in script.

To account for errors made by the student in earlier calculations, replace question variables with answers to earlier parts.

In order to create a variable replacement, you must define at least one variable and one other part.

The variable replacements you've chosen will cause the following variables to be regenerated each time the student submits an answer to this part:

These variables have some random elements, which means they're not guaranteed to have the same value each time the student submits an answer. You should define new variables to store the random elements, so that they remain the same each time this part is marked.

This part can't be reached by the student.

Add a "next part" reference to this part from another part.

None of the parts which can lead to this part are reachable either.

### Next part options

Define the list of parts that the student can visit after this one.

• #### Variable replacements

No variable replacements have been defined for this next part option.
Variable Value

### Previous parts

This part can follow on from:

This part doesn't follow on from any others.

### Parts

#### Steps

Give a worked solution to the whole question.