Two donuts and three cups of coffee cost 550 Five donuts and

Two donuts and three cups of coffee cost $5.50. Five donuts and four cups of coffee cost $9.20. How much should Julia pay if she wants to buy a donut and a cup of coffee?

Solution

Cost of donut = x

Cost of coffee = y

2x + 3y = 5.5

5x + 4y = 9.2

Adding Both

7x + 7y = 14.7

x + y = 2.1

She should pay 2.1$