a birthday party at downtown pizza costs $30 plus $6/guest at birthday party at city center pizza costs $50 plus $5/guest write an inequality to find the numbe of guests for which downtown pizza will be cheaper, solve the inequality. Solution cost in downtown pizza = 30 + 6x cost in city centre = 50 + 5x for downtown to be cheaper than city centre so 30+6x < 50+5x x<20 for guests less than 20 downtown pizza will be cheaper.