What is the slope of (15,8) and (-17,9)

What is the inverse of the function f(x) = 2x + 1?

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12