Simultaneous Equations - Application of Simultaneous Equations in Real World Contexts

A delivery company transports small and large parcels. Each small parcel has a mass of \(2\) kg and each large parcel has a mass of \(5\) kg.
A delivery van is carrying \(x\) small parcels and \(y\) large parcels with a total mass of \(79\) kg.

1. Form an equation in \(x\) and \(y\) to represent the total mass of the parcels.

   [1]

There are \(23\) parcels altogether.

2. Form another equation in \(x\) and \(y\), and hence find the number of small parcels and large parcels in the van.

   [4]