You have 500 sheets of notebook paper. After 1 week, you have 72% of the sheets left. You use the same number of sheets each week. Write an equation in slope-intercept form that represents the number y of pages remaining after x weeks.
To get 140, subtract 72 from 100. You get 28%. Then, multiply it by 500 to find out how many sheets of paper you used. You get 140 sheets of paper. So, the final equation is y= -140x+500.
