e B-1 Dodgy Dave's Car Yard, "Where Bargains are Hard to Drive", recorded the sales of cars and vans by Dave and Dudley in the matrix S. Each car sold for $10 000 and came with 12 months' supply of free petrol. Each van sold for $9000 and came with 6 months' supply of free petrol. This is recorded in matrix P. S= cars vans Dave 8 7 Dudley 5 9 P = $ car 10000 van 9000 Petrol 12 6 Use matrix multiplication to find a matrix showing the total value of the sales and the total number of months of free petrol given by each salesman. Use matrix methods on your CAS calculator to solve the simultaneous equations:

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