Please help.
Is algebra.

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Solve the system of equations y= 3/2 - 1, -x+ y =-3

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?