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Linear Relationships, SM-Bank 019 MC

A plumber calculates the price of a job using a service fee and an amount per hour.

This table shows some of the job prices.

 

Hours 1 2 3 4
Job price $90 $130 $170 $210

 
How are the jobs calculated?

  1. $50 service fee + $40 per hour
  2. $58 service fee + $32 per hour
  3. $60 service fee + $30 per hour
  4. $70 service fee + $20 per hour
Show Answers Only

\(A\)

Show Worked Solution

\(\text{Testing Option A equation with the table values:}\)

\(90\) \(= 50 + 1\times 40\ \ \checkmark\)
\(130\) \(= 50 + 2\times 40\ \ \checkmark\)
\(170\) \(= 50 + 3\times 40\ \ \checkmark\)
\(210\) \(= 50 + 4\times 40\ \ \checkmark\)

 

\(\Rightarrow A\)