Retrieval Practice: 11h unit 20

Toby is a plumber.
He starts a job at 9 am and finishes the job at 11 am For this job, Toby charges £70 for every hour it takes him to complete this job plus £50 for the materials he uses. Work out how much Toby charges for this job.

$\begin{array}{|ccccc|}\hline 1& 2& 3& 4& 5\\ 0.2& 0.1& \mathrm{x}& 0.25& 0.15\\ \hline\end{array}$

$\begin{array}{c}4x-2y=-14\\ x-2y=-17\end{array}$