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Edexcel IGCSE Math A Foundation 2.4.B Forming Linear Equations from Data

Edexcel IGCSE Math A Foundation 2.4.B Forming Linear Equations from Data
Edexcel IGCSE Math A syllabusMath A 4MA1First assessment 2018

Practise translating totals, costs, perimeters and grouped quantities into a linear equation and interpreting its solution.

How this is tested

  • represent each worded quantity algebraically before equating it to the stated total
  • form a cost or perimeter equation with consistent units and like terms collected
  • solve the equation, then substitute back to calculate the quantity actually requested

Question 16(b)

[Maximum number: 4]

There are 56 metal bars in a box.
Each metal bar is gold or silver or zinc.

y metal bars are gold.
(3y + 7) metal bars are silver.
(2y - 5) metal bars are zinc.

Work out the number of metal bars that are zinc.
Show clear algebraic working.