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Maureen is in charge of renting a climbing wall for the school’s fundraiser. The equation y = 170x represents the total cost of renting a climbing wall from Company A. The table shows the relationship between cost and rental time for Company B. The graph shows the relationship for Company C. Which company, if any, offers the best deal? Explain.

GRAPH COMPANY B:
2 340
3 510
4 680
5 850

GRAPH COMPANY C:
2 350
3 525
4 700
5 875

PLEASE EXPLAIN NOT ONLY SAYING WHICH COMPANY ONLY??!!