What is 431 rounded to the nearest hundreds

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

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?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?