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Select the correct answer from each drop-down menu.
The graph shows the total cost (y) of producing x motorbike engines.

A coordinate plane linear graph in the first quadrant with number of engines produced on X-axis and total cost in thousands of dollars on Y-axis. A line goes through (0, 2) and (20, 7).

Complete the following sentences based on the graph.

The equation of the line is y =
.

The total cost of producing 50 engines is
.