How would I produce a mathematical equation using x & y to work out & show how much a joiner has earned?

He earned £280 in week 1 & £360 in week 2 for fixing 10 & 20 door sets respectively.
With pay being linear, x= door sets fitted & y= weekly pay.
How would I use the information above to calculate the joiner's pay if he fits 37 door sets.

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