Please can someone help me with this if i dont pass this test i fail Parallelogram ABCD has diagonals AC and DB that intersect at P. If AP=8x−56, PC=24, PB=36, PD=4y+20, AB=4x+3y, and BC=5x−4y, find the perimeter of this parallelogram

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?