How do we call a function whose graph is a straight line

Airline passengers arrive randomly and independently at the passenger-screening facility at a major international airport. the mean arrival rate is 10 passengers per minutes. compute the following probabilities. p(x = 4) p(x > 11)

Select the number of ways in which a line and a circle can intersect

Complete the solution of the equation. find the value of y when x equals -5. -4x - 8y = -52