How many swimming lessons?

Equation to represent the cost

Ms. Hall's son took swim lessons this summer. The pool fee is \$25 and each lesson cost \$10.

a. Write an equation to represent the cost, y, based on the number of lessons, x.

b. How many lessons did her son take if she paid 145?

Comments for How many swimming lessons?

 Dec 17, 2012 Equation by: Staff Answera. Write an equation to represent the cost, y, based on the number of lessons, x. y = costx = number of lessonsThe pool fee is \$25 and each lesson cost \$10. y = (pool fee) + (\$10 per lesson)*(number of lessons)y = 25 + 10 * xy = 10x + 25Final Equation: y = 10x + 25 b. How many lessons did her son take if she paid 145? y = 10x + 25y must equal 145substitute 145 for y, and then solve for xy = 10x + 25145 = 10x + 2510x + 25 = 145Subtract 25 from each side of the equation10x + 25 = 14510x + 25 - 25= 145 - 2510x + 0 = 145 - 2510x = 145 - 2510x = 120Divide each side of the equation by 1010x / 10 = 120 / 10x * (10 / 10) = 120 / 10x * (1) = 120 / 10x = 120 / 10x = 12Number of Lessons: x = 12 lessons Thanks for writing.Staff www.solving-math-problems.com