Connecting Rules

x = 3

y = 4

Find 20 rules connecting x and y

Eg. 5y - 17 = x

A Mathematics Lesson Starter Of The Day


Topics: Starter | Algebra

  • S Curtis, Brune Park CC
  • One of my more industrious students thought it clever to sequence it as follows:
    y-1 = x
    2y-5 = x
    3y-9 = x etc...
  • Heeley's Y7 brainboxes, Rawthorpe High, Huddersfield
  • We thought this was bare cushtie (this means very good)! we recognised that there are an infinite number of possibilities.
    Watch out for Mr Heeley on Teacher's TV on May 5th at 10pm. (Sky channel 880, Virgin 240).
    God bless you all at Transum
    Love Y7 xx
  • N. Cox, Woodbridge, Suffolk
  • Excellent open-ended starter which led to work with powers, brackets roots and many different types of equations.
  • Jules, Longton High School
  • 5. More like this please!
  • 7ab/M4 The Best Maths Class In KA's, King Alfred's College OXON
  • Some students in the class came up with these examples:
    Then we thought about squaring the values.
  • Luke, Savio Salesian College
  • My class were very good at this starter,i think you should make a similar one.
  • Transum,
  • This starter provides an open ended opportunity for pupils to demonstrate what they can remember about algebra. It is a suitable activity for most ability levels and a quick walk around the classroom to see what pupils are writing provides a quick assessment of their understanding and imagination.

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Previous Day | This starter is for 20 April | Next Day


There are of course no end of correct answers and here are some examples.

There is at least one mistake. Can you find the errors when x=3 and y=4?

\(x + y = 7\) \(x - y = -1\) \(y - x = 4\)
\(2x + 3y = 22\) \(5x - 2y = 12\) \(4y - x = 13\)
\(xy - 10 = 2\) \(180 - 2x + y = 178\) \(20x - 3xy = 24\)
\(x^2 + y = 13\) \(10x - y^2 = 14\) \(y^2 - x^2 = 7\)
\(x^2y + 13 = 62\) \(x^2y^2 - 2x = 138\) \(x^2y^2 = 576\)
\(x! + y = 10\) \(5(x + y) = 35\) \(3y \div x = 4\)
\(\frac{xy}{2}= 25\) \(\frac{84}{xy}= 7\) \(\frac{15y}{5x}= y\)

Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.

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Laptops In Lessons

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Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Laptops In Lessons

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Student Activity


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