General Mathematics · Unit 1 · Linear equations and their graphs · Linear equations
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A mobile phone plan charges a monthly base fee of $\$25$ plus $\$0.15$ per minute of call time. (a) Develop a linear equation that describes the monthly cost $C$ (in dollars) in terms of the number of minutes $m$ called. (b) Use your equation from part (a) to calculate the monthly cost when $180$ minutes of calls are made.
A plumber charges a $75 callout fee plus $45 per hour for labour. Which equation correctly models the total cost, $C$ (in dollars), for a job that takes $h$ hours?