Communicate Mathematical ideas How do you know whether on both sides or subtract on both sides when solving an equatic?Please don’t give me a link.

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

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?