1. Tell whether each function is linear or not. A.6x2 = 12. Yes/no

B.3xy=27 Yes/no

C.-2(x+y)+9=1. Yes/no

D.4-3y = 2x +9. Yes/no

An equation where variables are used to represent known values—function notation true or false

How to use order of operation in 20 divide by 4 multiply 5 = 1

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?