Solve this real-world problem using a system of equations. The O’Donnells are having a birthday party for their son, and they plan to have a clown bring balloons to the party. Balloon Express charges $2 per balloon and $10 for delivery. Balloon Mania charges $1.50 per balloon and $20 for delivery. If the O’Donnells plan to order 30 balloons, which company should they choose, and how much will they save?(1 point)
Let x be the number of balloons and y be the price. Balloon Express charges $2 per balloon and $10 delivery, so y = 2x + 10. Balloon Mania charges $1.50 per balloon and $20 delivery, so y = 1.5x + 20.
We need to replace x with the number of balloons (30) and see which one if cheaper. We know x = 30. We put this into the first equation: y = 2*30 + 10= $<<2*30+10=70>>70. We put this into the second equation: y = 1.5*30 + 20= $<<1.5*30+20=65>>65.
Balloon Mania is the cheaper option since they charge only $65 while Balloon Express costs $70. The O'Donnells will save $5 by choosing Balloon Mania. Answer: \boxed{5}.