The line x − y = 2 is on a coordinate plane and contains EF, which is one side of square EFGH. What is the slope of the line that contains FG?
I just need the steps on how to do it.

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Which of the points a(6, 2), b(0, 0), c(3, 2), d(−12, 8), e(−12, −8) belong to the graph of direct variation y= 2/3 x?

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?