The side lengths of a triangle are given by the expressions 5x + 3, 5x – 5, and 3x – 2. write and simplify a linear
expression for the perimeter of the triangle.

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?