General Mathematics · Unit 1 · Linear equations and their graphs · Linear equations
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A plumber charges a callout fee plus an hourly rate for labour. For a 2-hour job, the total charge is $\$156$. For a 5-hour job, the total charge is $\$336$. Determine the callout fee and the hourly labour rate.
A mobile phone plan charges a base fee of $45 per month plus $0.12 per minute of call time. If a customer's bill for one month is $78.60, which option shows the number of minutes of call time used that month?