Question

The first graph.

Reason: y = 10x − 80 (ticket income minus the $80 cost). So y(0) = −80 and y(2) = 20 − 80 = −60, matching the line through (0, −80) and (2, −60).

Answer 1

Correct. If income is $10 per ticket and there is an $80 fixed cost, profit is y = 10x − 80. That has y-intercept y(0) = −80 and y(2) = 20 − 80 = −60, so the line through (0, −80) and (2, −60) is right. The break-even point is x = 8 tickets (y = 0).