--------------------------------------------------------------------- Define x : --------------------------------------------------------------------- Let the cost of the toy train be x. Toy Train = x Toy car = 2x - 20
--------------------------------------------------------------------- Construct equation : --------------------------------------------------------------------- The toy car costs $100. ⇒ 2x - 20 = 100
--------------------------------------------------------------------- Find the cost of the toy train : --------------------------------------------------------------------- Cost of the toy train = x = $60
--------------------------------------------------------------------- Answer: The toy train costs $60. ---------------------------------------------------------------------
Sandy's cost equation is y = 5x + 10 where y = cost and x = number of children. Kimmi's cost equation is y = 25 where y = cost. The fees are the same when x = 3 in other words when Sandy babysits 3 children. That is found by solving 5x + 10 = 25 for x. Subtract 10 from each side: 5x = 15 Divide by 5 on both sides: x = 3
