01Learning content
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Education context
A proposed Year 8 mathematics practice resource for introducing a two-step linear equation through a short length puzzle.
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Year 8 · Solve the equation
A ribbon is 20 cm long.
Set aside 5 cm. Cut the rest into 3 equal pieces. How long is each piece?
3x + 5 = 20
- 1
Subtract 5 from both sides
3x = 15 - 2
Divide both sides by 3
x = 5 cm
Check: 3 × 5 + 5 = 20 cm.
Quick check: which inverse operation removes the +5?