How do you rearrange y=a-x to make x the subject of the formula

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?