Simultaneous EquationsA selfmarking, multilevel set of exercises on solving pairs of simultaneous equations. 
This is level 1: equations that can be added or subtracted to eliminate one variable. You will be awarded a trophy if you get at least 9 correct and you do this activity online.
InstructionsTry your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help. When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file. 




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Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician? Comment recorded on the 21 October 'Starter of the Day' page by Mr Trainor And His P7 Class(All Girls), Mercy Primary School, Belfast: "My Primary 7 class in Mercy Primary school, Belfast, look forward to your mental maths starters every morning. The variety of material is interesting and exciting and always engages the teacher and pupils. Keep them coming please." Comment recorded on the 19 October 'Starter of the Day' page by E Pollard, Huddersfield: "I used this with my bottom set in year 9. To engage them I used their name and favorite football team (or pop group) instead of the school name. For homework, I asked each student to find a definition for the key words they had been given (once they had fun trying to guess the answer) and they presented their findings to the rest of the class the following day. They felt really special because the key words came from their own personal information." 
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Projectable  A set of simultaneous equations designed to be shown one at a time to the whole class.
Level 1  Equations that can be added or subtracted to eliminate one variable.
Level 2  Equations that can be added or subtracted to eliminate one variable after one of the equations has been multiplied by a constant.
Level 3  Equations that can be added or subtracted to eliminate one variable after both of the equations have been multiplied by constants.
Level 4  Equations with two variables that are not written in the standard way.
Level 5  Real life problems that can be solved by writing them as simultaneous equations.
Level 6  Equations which include fractions in some way.
Level 7  Linear, quadratic and other pairs of simultaneous equations.
These Level 7 questions will require you to be able to solve Quadratic Equations.
Exam Style Questions  A collection of problems in the style of GCSE or IB/Alevel exam paper questions (worked solutions are available for Transum subscribers).
More Simultaneous Equations including lesson Starters, visual aids, investigations and selfmarking exercises.
There is a printable worksheet to go with this activity. It is an exercise that appeared in an algebra book published in 1895. It starts with basic questions but soon gets tricky!
Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.
See the National Curriculum page for links to related online activities and resources.
The examples used in the video are available to teachers as projectable slides.
\(3x+y=34 \qquad \mathbf{A}\\2x+y=25 \qquad \mathbf{B} \)
You may notice that each equation has a \(y\) term so subtracting one equation from the other would result in the elimination of that term.
Subtract \( \mathbf{B} \) from \( \mathbf{A} \)
\(x=9\)
Substitute this value for \(x\) into equation \( \mathbf{A} \).
\(27+y=34\)
\(y=7\)
The simultaneous equations have been solved.
The solutions are \(x=9\) and \( y=7\).
You can check your answers by substituting them both into equation \( \mathbf{B} \) to see if it balances.
This example is not intended to teach you everything you need to know about this type of simultaneous equations. It is here as a reminder and is no substitute for your teacher or tutor.
Don't wait until you have finished the exercise before you click on the 'Check' button. Click it often as you work through the questions to see if you are answering them correctly. You can doubleclick the 'Check' button to make it float at the bottom of your screen.
Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you don’t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.
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