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Which will form a composite function?

Which linear function represents the line given by the point-slope equation y + 1 = –3(x – 5)?

The salesperson earns a 5% commission on the first $5,000 she has in sales. the salesperson earns a 7.5% commission on the amount of her sales that are greater than $5,000. this month the sales person had $8,000 in sales. what amount of commission, in dollars, did she earn?