msoutopico/trend_math_cg_6b.md

## trend_math_cg_6b.md

      
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UNIT 234: SEATS IN A CAR


CM936Q02
For security reasons, an extra aisle is created along the centre as shown on the right.
This reduces the number of seats in each row by 3.
The formula s = 3n + 23 does not apply to the new situation.
Enter the new formula which describes the number of seats per row.

Coding-0-1-9
SEATS IN A THEATRE - SCORING 2

QUESTION INTENT:
Description: Interpret or modify a linear equation in a context
Mathematical content area: Change and relationships
Context: Occupational
Process: Formulate

Full credit

Code 1:
A linear equation equivalent to s = 3n + 20.

s = 3n + 20
3 × n + 20
s = 3 × n + 23 – 3
s = 3n + 23 – 3

No Credit

Code 0:
Other responses

Old formula minus 3 [not a formula]
S – 3 [not sufficient]

Code 9:
Missing