I need help on this ​

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?