Two numbers have a difference of 0.85 and a sum of 1 what are the numbers

Which representation has a constant of variation of -2.5

The measure of an angle is 117°. what is the measure of a supplementary angle?

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?