When Am I Going to Use This?

In Grade 10 Mathematics, students have been investigating linear relationships and their applications in the “real world”. Plotting straight lines and identifying patterns has been the focus with a shift now to simultaneous linear equations. These have several applications, such as cost vs profit as well as many others. There has been a focus on using technologies to check calculations and graphs, using online tools such as Desmos.

Here's a question to try at home around the dinner table.

Two hamburgers and a packet of chips cost $8.20, while 1 hamburger and 2 packets of chips cost $5.90. Find the cost of a packet of chips and a burger.